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FAQs about Hermit, Anomuran Crab Identification
Related Articles: Hermit
Crabs, Crabs,
Marine Scavengers, Fresh
to Brackish Crabs,
Related FAQs: Hermit
Crabs 1, Hermit Crabs 2, Hermit Crabs 3,
Hermit Behavior, Hermit
Compatibility, Hermit Selection, Hermit
Systems, Hermit Feeding, Hermit
Reproduction, Hermit Disease/Health, Land Hermit
Crabs, Squat Lobsters, Micro-Crustaceans,
Amphipods, Copepods,
Mysids, Hermit
Crabs, Shrimps,
Cleaner Shrimps,
Banded Coral
Shrimp, Mantis
Shrimp, Anemone
Eating Shrimp, Marine
Scavengers, Crustacean
Identification, Crustacean Selection,
Crustacean Behavior,
Crustacean Compatibility,
Crustacean Systems,
Crustacean Feeding,
Crustacean Disease,
Crustacean Reproduction,
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Strange Crustacean: Need More
Information - 7/11/08
Hi. My name's Brian,
<Hi Brian, Lynn here this afternoon.>
..and I recently went to South Padre for the second time,
<What a great place that is!>
..and once again I caught this strange crustacean. I caught one on my
first trip to SP and spent days trying to identify it on the internet
but never found anything, and the same thing this time...I Googled "sand
flea", "sea lice", South Padre crustaceans", but could never find what I
was looking for.
<Yep, that’s frustrating.>
It surely can't be a new species because I saw several of them and I
can't be the only one who's come across one. But anyways, the crustacean
looked somewhat similar to a horseshoe crab. It was about 1 inch long
with a thin tail that was a couple of inches long. It was a pale white
color, had several overlapping segments to its carapace, and I couldn't
find any eyes on it. On the bottom it had, I believe six legs, and each
leg was like a small crab pincher. Please help me identify this
creature...I really really REALLY wanna know what it is!
<Me too! In all the years I’ve been going to the Texas coast, I’ve never
seen anything quite like what you’ve described. I looked around, did
some research and finally asked a nice fellow from the Natural History
Museum in Los Angeles for some help. Unfortunately, he needed more
information. He said that what you saw could be anything from a dead
Mole crab with its thin abdomen extended out behind it, to a large
isopod of some sort. Here’s a link that shows a bit more regarding Mole
crabs (Emerita spp.):
http://www.diatribune.com/marine-life-series-mole-crabs . The creature
also sounds a bit like a Cumacean, but I’ve never heard of one that
large and besides, they have more than 6 legs. Here’s a link with more
information regarding Cumaceans: http://en.wikipedia.org/wiki/Cumacea.
Unfortunately, at this point, I’d really need a good close-up photo in
order to have any chance at getting an ID for you.>
I wasn't able to get a very decent picture, the one we got is blurry,
and my step-dad isn't letting me have it for some reason.
<Well Brian, the next time you go back to Padre Island be sure to look
around for more of the little critters. You might want to see if your
camera has a “Macro” mode/setting, usually indicated by a small flower
or daisy-like icon. In macro mode, you should be able to get some good
shots. At that time, please do send them along. I’d love to solve this
little mystery! Take care, -Lynn>
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Re: Strange
Crustacean: Likely Mole Crab - 7/11/08
Hello again.
<Hi Brian!>
So this time I've included a picture, it's still blurry but it was the
best one out of five, and in conjunction with my description you can see
a little better what I was talking about.
<Yep, thanks for sending that along. It makes all the difference.>
I looked up more pictures of both of your suggestions, and I think the
creature I caught was likely some kind of mole crab
<I agree. It definitely looks like a Mole or Sand crab of some sort –
something in the Superfamily Hippoidea, possibly in the Family
Albuneidae.>
..(although it wasn't dead, because it was crawling around in my hand),
the only difference was that most of the pictures I found of mole crabs
didn't have the long thin tail I described (which you can make out in my
photo).
<Interestingly enough, I’ve seen Mole crabs that look very similar. The
only difference is that what looks like a tail is actually a pair of
antennae on the head. Take a look at this photo:
http://www.dnr.sc.gov/marine/sertc/images/photo%20gallery/Albunea.jpg .
At first glance, it looks like the narrower end on the right *should* be
the head, but it’s not. It fools the eye a bit. Here’s another link with
more information on Mole crabs in this Family:
http://www.crustacea.net/crustace/anomura/www/albunei.htm.
They’re neat looking little critters, aren’t they!>
But for now, I'm gonna assume that I caught a mole crab....but let me
know if you have any other opinions.
<I think we’ve got it!>
Thanks for the help.
<You’re very welcome and thanks again for sending in the photo! Take
care, -Lynn> |
Dardanus venosus in my tank!??!
Maybe - 5/2/08
Dear WetWebMedia crew,
Hello again.
<Hello Sherry>
I'm not sure how this hermit got in my tank, but is it Dardanus venosus,
the Starry-eyed Hermit Crab, which grows 3-5 inches?
<I’m sorry, but I can’t see the details well enough to make that
determination. Did it hitchhike in on rock from Florida, the Bahamas, or
the Caribbean?>
It has blue eyes,
<Do these have the distinctive star patterned (pseudo-)pupils?>
..lavender claws and it is bristly. Currently it is about 1" from claw
to claw, or leg to leg, however you measure. If it is a starry-eyed
hermit, how long may I expect it to stay small and relatively harmless?
<Growth rate will depend on water parameters and how well it’s fed. How
harmless it is, depends on what you have/value within your system. It's
also related to the relative size, speed, and accessibility of its
potential prey items. If you have a tank loaded with very small fish and
snails it could already be of a threatening size. If, however, it’s in a
tank with very large fish, it wouldn’t be too much of an issue. If it is
indeed Dardanus venosus, it should only be in large, fish-only systems.>
My son saw it pinch a Zoanthid polyp, but besides that it is a good
scavenger.
<I bet it is!>
Best regards,
Sherry
<Take care, -Lynn> |
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Re: Dardanus venosus
in my tank!??! Maybe - 5/2/08
Hello,
<Hi Sherry>
I just wrote to you about this crab, and then he was nice enough to walk
across the sand so I could take a couple of more pictures. These are my
three best pictures of him. It's hard to get a good picture, but I think
you can see the leg colors, blue eyes, etc... Any idea what it is?
<Unfortunately, there are many possibilities. Without being able to see
more detail or know where it came from, I really couldn’t tell you with
any certainty. My best recommendation is to look through the photos at
the links below for comparison. I’d also recommend that you keep a sharp
eye on the little fellow if you decide to keep it. The important thing
about hermits is that even those that are generally considered harmless
have the potential to prey on/pick at some of the favorable biodiversity
within a system, including snails. They’re also quite bold when it comes
to removing/robbing food from corals - sometimes to the point of the
coral's decline. Hermits are neat, but opportunistic little creatures
whose threat potential increases with size, crowding, and lack of
sufficient food. Keeping them well fed can help deter predation to some
degree, but the potential risk is still there. Here are the links I
mentioned earlier:
http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm
This link is in French, but it has some excellent photos with species
names included.
http://www.recif.be/article/hermit.htm >
-Sherry
<Take care, -Lynn> |
Elegant
Hermit Crab, coral abrasion 4/19/08
Hello Guys,
<Scott>
I just bought a beautiful hermit crab which I believe to be Aniculus
elegans, the elegant hermit crab. This ID is based solely on looking at
photos on the web and noting that most, but not all, of the sites
identify him thusly. A few think he is a Hairy Hermit Crab, Dardanus
Sp., including my LFS where I bought it, That Fish Place. The crab's
colors match EXACTLY the pink and maroon coralline algae on its shell,
and the tips of his hairs are turquoise. The crab is very beefy, i.e.,
all the outside legs are thick and strong looking, which doesn't come
through at all on any photo I have seen. My questions:
1. Is he Aniculus elegans; or can you point me to some web resource that
will help me identify him - that does not appear when you google
"Aniculus elegans" OR ("A. elegans" AND Aniculus)?
<I do think this ID is correct>
2. How often should I give him some fish or chicken?
<No chicken... too fatty, hard to digest...>
I am concerned that he is not getting enough food (due to his
exoskeleton, I cannot see if he is skinny). He is rather lethargic
compared to all my other hermit crabs (three thin striped plus lots of
reef janitors). He grabs and eats VERY sloppily the fish and chicken I
give him, but I would expect him to be scouring my rocks looking for
coral.
<I would offer this animal aquatic-based proteinaceous food purposely
2-3 times a week. Maybe via tongs...>
From the book, *Life and Death of Coral Reefs* Edited by Charles
Birkeland, chapter 4, *Bioerosion and Coral-Reef Growth: A Dynamic
Balance*, by Peter W. Glynn, Page 79:
Two species of hermit crabs that feed on live coral produce large
amounts of calcareous sediment when they scrape corals to remove soft
tissues (Fig. 4-1). The average mass of coral abraded by a small hermit
crab (*Trizopagurus magnificus* [Bouvier]) was about 10 mg ind.¯¹ day¯¹,
and for a large hermit crab (*Aniculus elegans* Stimpson) about 1 g
ind.¯¹ day¯¹ (Glynn et al., 1972). Relating hermit crab population
densities and erosion rates, it was found that *Trizopagurus* and
*Aniculus* respectively were responsible for the generation of about 1
and 0.1 metric tons of coral sediment per hectare per year on a fringing
reef in Panama (Table 4-2). Since this rate of coral abrasion by hermit
crabs has not been reported elsewhere, it is possible that these high
levels of erosion are unique to the eastern Pacific.
<Wow!>
Grace and Peace,
Scott
<I would keep an eye on this (and all other hermits, true crabs...) vis
a vis your stony corals. Cheers, Bob Fenner> |
|
 |
Dardanus
deformis, Hermit ID 3/30/08
Hello,
<<Hi Mike.>>
I love your web site, its helped me a lot in the past.
<<Glad to hear it.>>
I bought what I thought was three blue legged hermit crabs from my LFS a
couple days ago and I thought that one of the hermits had just lost some
color. Today I really checked the one out and he is definitely not a
blue leg. He has white legs with tan marks and white claws. I read
through the hermit ID page and I think there was one that may match him,
you called it a "Rock Hermit Crab". Will he bother my corals (Xenia,
Caulerpa, and some button polyps), inverts Feather Dusters, Flame
Scallop, multiple Brittlestars, Blue Tuxedo Urchin, Banded Coral Shrimp,
and a pink/green sea cucumber), or my fish (Fire Dartfish, Yellow Tang,
Ocellaris Clownfish, and a Starry Dragonet). Should I take him back to
the LFS? I also have a tank with a Yellow Banded Pipe Fish, a black
brittlestar, and a Sexy Anemone shrimp. There are no corals in this
tank. Would he be better suited for this tank?
<<Okay Mike after seeing the photo, which I’ll say as a disclaimer is
not the best way to ID, I am in agreement that your specimen does
resemble a Dardanus deformis aka “Rock Hermit Crab.” As far as safety
goes, you do have some sensitive critters in there and Dardanus deformis
does get to be on the rather large size…as with all hermit keep that old
phrase in mind…opportunistic omnivore. Perhaps returning him before he
gets to large would be the wise choice. >>
Thank you for all your help!
<<Anytime.>>
-Mike A.
<<Adam J.>> |
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Hermit Crab
ID – Family: Paguridae - 2/26/08
Hello!
<Hi Laurie!>
If you would be able to answer a question about a hermit crab ID that
would be great.
<I'll sure try!>
One of my coworkers brought it to me after a mini-scuba diving trip this
weekend.
<Mmmmm, not such a good thing to do. These are better left in the wild.
Not to mention that it might very well be illegal!>
It is currently in a fish only set up with 3 other pretty peaceful crabs
of the same size (2-3 inches). The only reason I am inquiring about this
crab is because of the color (red), and a past experience with a crab I
bought from a LFS that told me how "peaceful" the crab was. Only to find
it trying to catch fish mid-swim to eat it (successful once before he
was returned).
<Yikes!>
That one I have come to figure the "scarlet hermit crab" as it was sold
to me as, was actually a "white spotted hermit crab".
<Double yikes! Dardanus megistos can grow to a very large size and is a
definite threat to fish. It's an attractive, but aggressive hermit.>
So getting back to my main question, would you be able to ID the crab in
the photo,
<Heeee! I wish I had a penny for every reddish/brownish hermit out
there! Complicating matters is that I don’t know where this hermit is
from, or if it was taken from the ocean, or the beach. Location can make
all the difference in identification. The shell it’s in looks very much
like Strombus pugilis or Stombus alatus, aka the Fighting Conch from
Florida/Gulf of Mexico, but I could be wrong. Please see this link for
comparison (note the degree of variation within the species):
http://www.jaxshells.org/strombss.htm
Unfortunately, there are just too many possibilities to give you an ID
to species level. The best I can do is tell you that since it appears
that the right claw is larger than the left, then it’s likely in the
family Paguridae.>
..and if so, the common temperament of this crab? In my tank I have a
Diamond Goby, pair of False Percula Clowns, and Chalk Basslet whom I'd
really like to keep alive in that tank and not worry every night they
might become dinner to this newcomer.
<Understandable. One thing I can tell you from personal experience is
that I don’t trust large hermits. They tend to be opportunistic
creatures with voracious appetites. Keeping them well fed could help
deter possible predation issues, but there are no guarantees. Please see
this link and those at the top of the page for more information and
photo comparison:
http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm
>
Thanks Again!
Laurie
<You're very welcome, and good luck! Take care, -Lynn> |
|
 |
Hermit Crabs, ID...
02/01/2008
Hi!
<<Hello, Andrew today>>
I bought 3 hermit crabs from the LFS. I think they might be the Coral Hermit
Crab (D. tinctor). Blue eyes, body is not bristly like the Starry
eyed, so I'm pretty sure its not that. They are quite large, about 3-4 inches in
shell length. Anyways, my question is about the 4th one I got (The guy at the
LFS thought it was an empty shell and gave it to me.. much to my surprise, it
was gone from where I place it the night before and lo and behold! It was a
crab!)
<<A nice surprise>>
Went back to the LFS, paid for it, and thought all was well. Well, all is well,
kind of. It looks like a C. vittatus hermit crab.
<<An attached photo would of enabled us to confirm>>
The other 3 have been happily climbing around everywhere, munching on algae,
picking up the crushed coral and doing what I can only describe as, scraping off
particulates. However, this C. vittatus is not moving around a lot. It tends to
like to burrow into the substrate next to my LR. I'm afraid its not eating and
it will starve. Any advice?
<<If it is the C. vittatus, it should be fine. These act in much the same manner
as other algae eating crabs and as such, I would not be concerned for its well
fare. Keep a close eye on it.. Read more here about half way down..
http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm >>
Regards, Brian
<<Thanks for the questions. A Nixon>>
|
Hermit crab of
Thailand traveled to Holland... ID, care – 08/27/07
L.S., 17 august our son took with him a nice, empty (so we thought)
shell. We were on holiday in Thailand. He found the shell at the beach
at the island Ko Pha Ngan in the Gulf of Thailand. After more than 24
hours of traveling we exposed the shell at home on a table and had a
look at it once in a while (dreaming about Ko Pha Ngan). Saturday
evening (25 august) we looked at it again and saw it walking! The shell
obviously was not so empty as we thought. We think it is a marine hermit
crab. The shell is about 7 cm long.
The crab has dark brown paws with little hair and blue stripes. I asked
my son and he told me he found the shell at the beach, near the coral,
but within the range of tide. I would have loved to bring back the poor
animal.
Unfortunately, Thailand is so far away.
So I called the Zoo of Rotterdam and asked them if they could take care
of our new pet. They will!!! We brought it yesterday to the zoo. They
will investigate which kind of hermit crab it is but I am not sure if
they succeed (they have so many animals to take care of.). So I looked
on Internet to see if I can learn more about hermit crabs. At that
moment I found your marvelous site. I hope you or the forum could help
me in identifying the creature. Attached you'll find a picture of the
crab. Maybe one glance at it is enough to identify the animal? If so, I
can inform the Zoo so they can take even better care of the crab. We
hope you will have a look at the picture. I tried to post this message
on the forum but unfortunately this was not possible (the sign-in
process was the problem).
Thanks a lot for answering,
Best regards
Annemarij
<Hallo Annemarij! The crab looks like a Clibanarius sp. hermit crab.
These are quite common in the aquarium trade. They are very hardy
animals and easy to keep. There are many species, some found in
freshwater, brackish, and marine environments. Many species are
intertidal animals, adapted to quite extreme changes in temperature and
salinity. This is probably why they do so well in aquaria! The feed
mostly on algae and organic detritus. Marine aquarists usually keep
Clibanarius tricolor, a marine/brackish water species; freshwater
aquarists may sometimes be offered Clibanarius africanus. Assuming you
found your specimen on a saltwater beach, then you should keep the
hermit crab in a tropical marine aquarium. Generally these hermit crabs
are unproblematic. The only issue when keeping hermit crabs is they need
access to empty shells as they grow. I hope this helps, Neale>
Re: hermit crab of
Thailand traveled to Holland 8/28/07
Dear Neale,
Thanks a lot for answering my mail! It certainly help me. I'll inform
the Zoo Blijdorp of Rotterdam and hope that 'our' crab will have a happy
and long life.
Again, many thanks.
Best regards,
Annemarij
<You're most welcome, and I'm glad the little crab is going to have a
pleasant life at such a nice zoo. Cheers, Neale>
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Marine hermit crabs? ID, care
– 08/27/07
This past weekend I was in Cape Cod, MA. Some friends and I were in the
ocean (just ankle deep), and we saw a bunch of tiny hermit crabs in the water.
They are only the size of my thumb nail, maybe slightly larger.
Well of course we made the dumb decision to bring some home, and now I have 4 of
them in a water bottle with salt water and sand and rocks in it. So far they are
fine. I went to a pet store today and bought a bunch of stuff for them. But once
I got home and did more research I am realizing to my horror that I don't think
these are land hermit crabs like I was thinking. Can I keep them in captivity or
will they die?? I bought a little plastic container and sand and a sponge for
them, but I think they need to be fully submersed in salt water don't they??
Should I get a whole salt water aquarium system for them?? I'm not finding much
info on how to care for Marine hermit crabs, and I'm afraid these cute little
guys will be dead any day now!!!!!! Please help!!! Thanks.
Natasha (If you need a picture of them to identify I can send one later.)
<Hello Natasha. Identifying a hermit crab to species level is very difficult
without a photo. But in the cooler parts of the North Atlantic then species of
the genus Parugus are most common, both along the North American and European
coasts. So I'm assuming you have one of those. They are indeed fully aquatic
hermit crabs, though they are well able to tolerate exposure to air for some
time, and will scuttle about in very shallow water even with half their bodies
exposed. But for long term care you will need to set them up a "coldwater
marine" aquarium. This is not difficult. Firstly, you'll need a tank around the
10 gallon mark. Then you'll need a filter. I'd recommend a simple air-powered
box filter filled with ceramic media and a bit of filter wool. There's no need
for carbon or anything else. The aquarium needs to be filled with artificial
seawater -- that is, water with about 35 grammes of *marine aquarium salt mix*
added per litre of water. Using a hydrometer you need to aim for a specific
gravity of about 1.027 at 18 degrees C, the maximum safe temperature for these
crabs. Try and keep them cooler if you can. I have a little program called
'Brack Calc' on my web page (
http://homepage.mac.com/nmonks/ ) that lets
you relate the required salinity (35 g/l) with whatever temperature you have and
the specific gravity you can directly measure. Beyond this, keeping hermit crabs
is easy as they are quite hardy and adaptable. They are omnivores, mostly
feeding on algae, organic detritus, and carrion. In the aquarium almost anything
will be accepted, from algae pellets to raw seafood. Don't overfeed them though.
Apart from the fact these animals don't need extra light and don't like warmth,
in terms of basic care they are otherwise similar to tropical marine hermit
crabs. Hope this helps, Neale>
Hermit Crab Possible
Misidentification 8/19/07
*
First let me say that your site really is great. When I buy aquarium books, I
look for your names, period.
Concerning this email, I would appreciate a response, but it need not be public
(although I don't mind if it is).
<We post all>
I believe the photo in "Hermit Crabs, Use in the Marine Aquarium Hobby"
(http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm)
labeled *Phimochirus *[aka *Pylopagurus*]* holthuisi* (Provenzano, 1961),
Red-striped Hermit, is really *Clibanarius vittatus* (Bosc, 1802), Thinstripe
Hermit.
*
<Have tried to look just now... via Google mostly... to discern... Humann, does
state that the Red-Stripe Hermit has "one claw greatly enlarged... movable
pincer is white"... which in viewing the original (aquarium) image of mine is
obviously not the case...>
My reasons:
1. Color and Markings:* The photo you have in "Hermit Crabs, Use in the Marine
Aquarium Hobby"
(http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm)
looks nothing like the photo in
http://www.gsmfc.org/seamap/picture_guide/Hermit%20Crabs/phimochirus%20holthuisi.pdf,
but does look like the photo in
http://www.gsmfc.org/seamap/picture_guide/Hermit%20Crabs/clibanarius%20vittatus.pdf
.*
2. Claws:* Even if the photos were of such poor quality that color and markings
were not reproduced well, notice the one huge claw of *P. holthuisi*, and the
matched claws of *C. vittatus*. I do not think the one crab in your photo just
happened to have matched claws at that point in time because I have seen many
photos on the web that are *supposed* to be *P. holthuisi*, and all of them with
the same longitudinal stripes on the legs also have matched claws. Obviously,
these photos are incorrectly labeled, also.*
3. Habitat:* *P. holthuisi* is "Found on shell, sand, mud and coral bottoms from
15 to 104 m." *C. vittatus* is "Common on harbor beaches and on borders of mud
flats; rock jetties; water line to 22 m." Perusal of the web (your site and
others) indicates that people who find hermit crabs looking like your *P.
holthuisi* photo have found these guys very near the waterline, definitely not
15 m below it.
*
Elsewhere on Your Site
*
Some confusion in general: Note the entry in "FAQs about Hermit Crab
Identification", http://www.wetwebmedia.com/hermitidfaqs.htm:
*
Re: hermit crab question 8/1/06
*Thanks for your patience. I believe that they are red striped hermit crabs.
<Clibanarius vittatus?>
*
Spread to the Web
*
Interestingly enough, I believe the misidentification has spread to others on
the web. You guys have a very powerful site! The whole thing is becoming
circular. E.g.,
<Yes... perhaps too powerful... and circular...>
http://www.saltcorner.com/sections/zoo/inverts/crustaceans/hermitcrabs/Pholthuisi.htmhas
Bob Fenner's picture of (what I contend is)
*C. vittatus*. It is a higher resolution photo of the one on your site, so
people can more easily (incorrectly) identify their hermit crabs.
<Will post today as our "daily pic"... Am assured here that your ID is correct>
*
Recommendation
*
If I am correct, I think you should at least do #1.
1. In "Hermit Crabs, Use in the Marine Aquarium Hobby" (http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm),
either change the picture or change the description. As you have pointed out
elsewhere, *C. vittatus* does get rather large, 10 cm at least (Adam J. said he
had one (actually, he said it was *P. holthuisi* in a 6" shell).
2. Add *C. vittatus* to your list of hermits.
3. You might want to go through the references to *P. holthuisi* and correct
whatever was said about them.
Thanks for considering this,
Scott Allen Rauch
--
Scott
<Thanks much for this Scott... will addend/fix today. Sending notes to récif et
al is going to be a bit more extracted task. Cheers, Bob Fenner>
Atlantic
Hermit Crab ID – 06/20/07
Good morning,
<<Hello Jason>>
I picked up (literally) this hermit in Myrtle Beach over the weekend.
<<Ah!...is about a 3-hour commute from my home here in Columbia>>
He was in about 3-feet of water during low tide. He's currently in my QT
and is doing fine. He's even eating a few pellets daily.
<<Mmm, yes...voracious appetites>>
He isn't very active during the day, but he's all over the place at
night. He's quite quick too--look at those long legs!
<<I see them...>>
Do you have any idea what he is, or if he's reef safe?
<<I believe what you have is Pagurus longicarpus or the Long-claw Hermit
Crab. These are quite common along the Mid-Atlantic coast. It is a small
crab and appears primarily to be a detritus feeder, but this hardly
means it will prove reef-safe. But for the mostly commensal “Acro” crabs
(and these even bear watching, occasional removal) I don’t put “any”
crabs in my system as they are too “opportunistic” in their feeding
behavior for my liking. If you like/find the crab interesting you can
give it a try but keep a close eye out for problems. Also...as a
temperate to sub-tropical species, placing in a tropical marine system
will likely shorten its life-span>>
Thanks,
Jason
<<Happy to share. EricR>> |
|
Re: Atlantic Hermit Crab ID - 06/20/07
Thank you.
<<Quite welcome>>
I will probably place him in my sump or 'fuge to be on the safe side.
Thanks,
Jason
<<Regards, EricR>> |
|
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ID of Hermit needed please: Dardanus
megistos 3/31/07
Hi,
<Hi Wikus, Mich here.>
Could you positively ID this crab for me please? I bought it a
Clibanarius tricolor, but to be honest, it does not look like the pics I
have seen.
<Yeah... no, definitely not a Clibanarius tricolor. Looks like a
Dardanus megistos, which is not reef safe, is highly aggressive and
predatory and can get up to 11.7 inches!!!
Many thanks
<Welcome! Mich>
Wikus |
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Hermit crab identification - 03/24/07
Any chance you can ID this crab? I placed an order online, and this
crab came in with the Nassarius snails i ordered, complete with
Nassarius snail
shell. It is devilishly quick. It scuttles left and right rather than
forward. I am not sure if that helps. It has a sand colored appearance
also.
I currently have it residing in my sump, in a container with a mesh top
so it won't escape. It is only 1/4-1/2". Thought or suggestions as to
what I can do with it?
<Enjoy it>
If it wasn't going to hurt anything i was going to let it loose in the
sump. Would it take out my pods I have in their or would it focus on
detritus?
<No way to tell, but I'd leave it there>
If I put him in there should I add several empty shells?
<A few would be a good idea>
Thanks for the help!
Brian
<Mmm.... Might be Dardanus deformis... a/the "Rock Hermit Crab"... can
get a bit too large...
http://images.google.com/images?q=Dardanus%20deformis&rls=com.microsoft:en-us:IE-Address&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7PCTA&um=1&sa=N&tab=wi
Bob Fenner> |
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 |
Mystery Hermit 2/11/07
Hello,
<Hey.>
You guys run a great website that I use often.
<Great.>
However I have looked all over the sight to try to identify this hermit crab
that i got in a group of dwarf blue hermits. He is a green color with a
single vertical stripe going
down each leg with white spots on his claws.
<Oohh sounds like Phimochirus holthuisi, I too received a juv. mixed in with
some other hermits once.>
he looks very similar to the dwarfs hermits. The color of the green is
similar to that of an emerald crab. Sorry that I can't get a pic for you
right now, I loaned my camera to
a friend.
<Google the name I gave you above, I willing to bet that's your crab.>
I am worried that he might not be reef safe any ideas?
<Mmm....the problem with the crab I named is not so much that he attacks
sessile invertebrates but that it attains a rather hefty size and becomes a
little clumsy.>
So, far I haven't seen him going for corals or anything yet but he is only
maybe 3/4 in shell included.
Thanks for the help.
<Anytime.>
Steve
<Adam J.>
Hermit crab identification
1/16/07
Hello and thanks for reading my email. I unwittingly brought home a
resident of what I thought was an empty shell from vacation. (How many
hundreds of times do you hear this?!)
<A bunch... even done it myself a few dozen times...!>
A week after returning home, I was oiling some of the shells when one
of them started moving in the collection box--woops! They certainly
must be resilient little critters.
<Oh yes>
I've been searching online for information, and have learned that
marine, land and "hybrid" hermit crabs all need very different care.
<Yes... there are terrestrial, amphibious all the way to completely
marine species>
He/she has been nearly entirely hidden in his/her shell, but I read that
holding the shell in the warmth of your hand might bring them out, and
it did. I'm attaching a couple of pictures I took in hopes that you can
help me identify this fella. I would gladly return him to his home
beach, but I'm 1000 miles away.
Sally Stephenson
Frostburg State University
Frostburg MD (nowhere near the ocean)
<Yikes... yellowish eye stalks, bluish eyes, striped legs... see it
here:
http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm?
Bob Fenner> |
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Re: hermit crab identification 1/17/06
Most closely resembles Phimochirus holthuisi to me, what little of him I've
seen. Does that mean he should be completely submerged in appropriately salty
water, or does he need a "land" area as well?
<This is an entirely aquatic species:
http://www.gsmfc.org/seamap/picture_guide/Hermit%20Crabs/phimochirus%20holthuisi.pdf>
Is temperature critical?
<That it be stable... yes>
The pet store gave me shrimp pellets, but so far he's shown no interest in them.
Thanks,
Sally
<Read my friend. Bob Fenner>
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Aquatic Hermit crab identification
10/26/06
Greetings,
<Salutations>
Recently I have become quite interested in aquatic Hermit Crabs, and I have been
doing quite a bit of digging for information on them. It seems there is very
little information on them available, outside of WWM.
<Mmm... bunches of non-husbandry information re these anomurans in large
libraries>
I have also managed to pick up a few oddball Hermits from my LFS, which I have
not been able to identify for the life of me. I've Googled, and I've Googled,
and I've Googled....
<Not Google-able presently>
But to no avail, I have not been able to ID them. Either I am not good at
searching for things on google, or the photos/information are extremely hard to
find/non-existent.
<Just not ready-referenced>
I have included the pictures of the oddballs on this e-mail.
I was hoping you guys could help ID them? I've included 5 pictures of 3
different types of unidentified hermits, labeled "A", "B", and "C".
More pics on the way as well, I've got 2 others that I can not ID, but they are
hard to photograph.
Once I have gathered enough info and gained enough experience, I am considering
starting a webpage for aquatic hermit crabs. There just doesn't seem to be any
one webpage with enough info, pictures, and scientific names.
Oh, and if Bob Fenner is reading this, you may remember me from IMAC! I was one
of the puffer guys, and we also talked over e-mail a bit in the past.
Regards,
-John
<Ahh! Pleased to make your re-acquaintance. Can't recall from my feeble memory
what these might be... do "practice" setting them up on a rock... waiting
patiently for their re-emergence to photograph with a bit more detail... and
send along again. Bob Fenner, out away from references... in Thailand> |
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Hermit crab question... Marine/Amphibious? Floridian... 7/31/06
I have been surfing your site trying to find the answer to my question but
there is SO MUCH INFORMATION my head is swimming.
<Mmm... not on just Marine or "Land" Hermits...>
Please help. My family recently brought back 6 marine hermit crabs from Destin
Florida. There are two large ones, and 4 much smaller ones. They are all brown
with striped legs. We decided that we would set up a small salt water aquarium
for them.
<Hope it works>
I am having troubling finding out exactly what I need to do this. What are
their living requirements?
<A cycled marine aquarium of adequate size... if they're truly all-aquatic
species. Can't discern from your brief description>
Right now they are in a Tupperware container with some sand and sea water from
Destin and we have been feeding them krill. Any info you can give me would be
great.
Thanks for you patience.
Callie
<Mmm, well... First need to find out if these are amphibious or full-time
aquatic species... as their environment will be necessarily very different. Such
identification may be able to be done on the Net... searching under the terms:
"Hermit Crab Identification Florida"... perhaps looking at the "Google Images"
from this search. Do you see this species? Once you know their habitat (from
reading on the Net), you can proceed for terrestrial:
http://wetwebmedia.com/FWSubWebIndex/hermitcrabfaqs.htm
or aquatic:
http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm
and the linked files above either one... Bob Fenner>
Re: hermit crab question 8/1/06
Thanks for your patience. I believe that they are red striped hermit crabs.
<Clibanarius vittatus?>
The smaller ones have been riding on the backs of the larger ones and basically
staying out of the water. Does that mean they need some dry land in their
aquarium?
<Yes>
If their tank has both areas in it, does it still need a pump of some kind?
<Yes... and a filter>
What about a heater or will a light be enough?
<Might be>
What kind of testing supplies am I going to need? What should the ratio of live
rock to sand be? Thanks for your help. I have tried stores in my area but not
found much help so far.
Thanks again
Callie
<Please read here:
http://wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm
and the linked files above. Bob Fenner>
Sea shells from the sea shore... Please, no. Accidental Hermit ID
06/14/2006
hi there,
I have a little problem, I have just returned from a trip to florida and after
unpacking the sea shells that I brought back as souvenirs I found my
self a new little friend, he is some kind of hermit crab both claws are the same
size and he is hairless from what I can tell he kinda looks like a
spider and is brown with lighter color rings...he survived over a week wrapped
up in paper towels and a plastic bag I was wondering if you might be able to
help with the species of crab and care of him...
Thank you
Michelle
<<Michelle: Now you know the dangers of collecting shells at the
beach. Without a picture, it's hard to tell what it is. From your description,
it might be a Common Squat Hermit Munida pusilla. If you do a search by those
names, perhaps you'll find a picture that looks like what you have and hopefully
some advice on how to take care of it. If you can take it back to the beach,
that's what I would do. Best of luck, Roy>>
Hermit crab ID - is it safe? 8/24/05
Hello crew,
First, thanks for all the hard work you guys put into this site. It is
really appreciated by us newbies. I've learned more things reading your
FAQs than most other sources online.
<Ah...>
On to my issue. Some of my SPS have been losing their polyps and this
week, I'm suspecting a hermit crab. Yes, yes, I realize that this could
be caused by so many other reasons, but I just wanted to eliminate some
of my variables. The main reason for my suspicion is that I saw this
hermit crab standing on top of my green Pocillopora one night. After
walking closer to the tank, he scooted away - quite rapidly I might add.
<Implying guilt?>
Here's a link to a picture of it.
http://i11.photobucket.com/albums/a193/gil716/orangehermit.jpg
Your help is appreciated.
Regards,
Gil
<Mmm, does look guilty! I am not a fan of "using" hermit crabs in
general marine aquariums period... I would remove this one. Bob Fenner>
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Pylopagurus holthuisi, Marine Hermits 10/21/05
Hey Guys,
<Hi Tate.>
I have been looking all over the web and I cannot identify what type of
Hermit Crab I have. <Lets see what you have here…>I don't currently have any
pics of my own, but I did
manage to find two on ReefCentral pics:
http://reefcentral.com/gallery/showphoto.php?photo=67809&papass=&sort=1&thecat=999
http://reefcentral.com/gallery/showphoto.php?photo=3052&papass=&sort=1&thecat=999
<He looks like Pylopagurus Holthuisi to me common name: striped hermits or red
striped hermit.>
In case the pics don't work he is a large green hermit with white stripes
running vertically down his legs. <They work.> It is very peaceful and eats a
ton of algae. I got him when I first started and did not know any better, but I
really like it and want another one to go with him in a 180 gallon reef
tank. Any information would be useful. <The crab itself is quite hardy, usually
an incidental acquisition when purchasing other smaller “reef” hermits. They can
grow quite large, in fact I have a specimen who currently inhabits a 6” shell.
He was a fine reef citizen but as he got bigger began to topple sessile inverts
and prey on other crustaceans and mollusks. I would keep a close eye on him and
provide plenty of extra shells.>
Thank you, Tate
<No problem, Adam J.>
Hermit Crab ID, care, literacy 8/1/05
My hermit crab is more of a black color but looks like he has stripes that
are a lime green. So what kind of a hermit is he.
<Mmm, I'd try the ID books of Paul Humann and Ned DeLoach here... am out in HI,
so, don't have access to my copies>
I found it in pensacola
florida at navarre beach.
<These places are proper nouns, capitalized>
so he was used to being in salt water. my
questions are: is it ok to put him in fresh water, does it need water in it's
tank to just go in or to drink or does it like to swim.
<... do need seawater... to live in... if it was collected from such>
how can you tell if
it's a male or female and how old it is. I heard they like to be in groups
of 4. will it be ok by itself? This crab is very friendly it has some fur on
the legs so it reminds me of a spider. Its cool that I found it in the wild
and it's not afraid of me. I want to do the best I can to enjoy it as a pet
but also keep it happy and alive. am going to Michigan to live with my mom.
am in florida on vacation. so am bringing my crab with me. so any info u can
give me is great. thank you for your time.
Camille
<Please read here:
http://wetwebmedia.com/FWSubWebIndex/hermitcrabfaqs.htm
and the linked files... Bob Fenner>
Re: hermit, further poor grammar examples! 8/1/05
Thanx 4 correcting my grammer even though it has no relevance to my hermit
crab whatsoever and i didn't know i was writing an essay 4 english. But just
so u know my poor crab died. It's all your fault cuz u didn't respond quick
enough.
Camille
<Your English is still atrocious... Grow up, learn how to communicate in your
native tongue, sit up straight, wash your hands... Heeeeee! BobF>
Crab hitchhiker, using WWM
My family and I just returned from a trip to Mobile, AL on Dauphin Island.
My kids were picking up shells from the beach and accidentally took one with a
small crab still occupying his home. The shells sat in a plastic bag for
almost two days and now that I've discovered our new friend, and his will to
live,
I would like to keep him alive somehow. From internet info, I think he is a
red striped crab. No clue what to do. Help me save the poor guy!
Paul
<Paul... help yourself... your answers are posted, archived on WWM... use the
index or search tool on the homepage... re "hermit crabs". Bob Fenner>
Hermit Crab ID
Thanks James (Salty Dog)
<You're welcome>
Was able to talk the Local Fish Store into giving me some shells for my hermit crabs that were in their tanks but empty. The ones they had for sale had a different opening. The crab ID was uneventful. Wasn’t able to find a match. I used a magnifying glass and may be able to give you a better description. One hermit crab has a turquoise carapace. At the end of the first joint or knuckle from the carapace is a large turquoise dot it covers the whole knuckle. The rest of the legs are maroon with white irregular polka dots and covered with white tipped hairs. Oh boy, this isn’t easy. I can’t imagine it’s easy for you either, no picture. The second hermit crab has legs that are banded brown and tan, white tipped hairs and has large dots of red or orange on first joint from carapace. Unfortunately
where I bought them, they are sold only as “hermit crabs” no names are given and the staff doesn’t know what they are.
<Based on your description, other than what I mentioned in a previous email, I can't find anything that resembles that either. I see on your other email you were able to identify one of them.>
I also bought an oyster after reading they would be good at keeping the water clear. Yea or nay?
<Oysters are filter feeders and require a plankton source such as DT's phytoplankton. Without a daily source of food your oyster won't survive long.>
Also, how can I keep my feather duster from falling out of his niche?
<Build up some rubble around the tube.>
I purchased three peppermint shrimp, one survived. It has developed a black tail. Any problems with that?
<I wouldn't be concerned about it, probably will be gone after his next molt.>
He is very aggressive. Steals food from all other inhabitants including an anemone. Is this natural? Thanks again for your help. - Thomas David
<Not unusual. James (Salty Dog)>
Hermit Crab ID
What's up Salty Dog - I was able to find one of the hermit crabs with an oceanic crab image search. The one with the turquoise spots is Dardanus guttatus. The second crab I’ve yet to find. Thanks for your time and help. - TD
<You're welcome. James (Salty Dog)>
Hermit Crab ID
Date: Fri, 11 Feb 2005
Although I have been an avid freshwater aquarium hobbyist for 30 something years, I recently got bit by the mini reef bug. I have two hermit crabs I cannot identify. Both have hairy red/maroon legs/claws with white irregular sized dots. The difference is that one has round blue or turquoise “knee-caps” and the other has round red "knee-caps”. Would you please identify them for me?
<Thomas, just based on your description there is a good chance they could be
P. operculatus or P. cadenati. Do a search on these and see what comes up.>
I would like to do a little research on them but don’t know what they are called. My second question is: What kind of problems can arise if a hermit crab needs a larger shell and there isn’t one available?
<None should arise, he is just going to be in cramped quarters.> In addition, Will any shape opening do? I have noticed that some shells for sale have a round opening and some have an opening that is more long and narrow. Which shell shape is more appropriate for my oceanic hermits?<Get shells similar to the one they use. They know what they are looking
for.>
I am very grateful for any information you can provide, no matter how brief or extensive. At this point I’m clueless. Thanks!
<Good luck. James (Salty Dog)>
Is this crab reef safe?
Good Evening All
Big fan of Wet Web Media site from the UK here. I want to thank you guys
more than anything. You have been invaluable in my venturing over from
tropical freshwater to the dark side aka MARINE!
Feeling that my LFS (love that shop) was trustworthy, I bought this
little critter (must be nearly 2inch body length) taking their word that
he was a blue legged hermit, or Clibanarius tricolor.
Then I started looking for pics as I didn't think he looked right, lo
and behold, he ain't one of them. In fairness his legs are blue, but not
solid blue, they're stripy. Now I'm very attached to Herman (Hermit to
his friends), but this tank is going to be minimal fish, maximum reef
and I'm scared he's going to have to go.
<< You can always take him out later, so I guess I wouldn't worry
much. But on the other hand I also want to say "why change it" and just
have you keep him out of the tank. >>
I would really appreciate help in identifying him. I can't find any pics
like him. << I don't have any ID info, but I'll bet he is reef safe. >>
Thanks in advance, for all your help, and for these fab pages, Marie :)
<< Blundell >>
Hermit Crabs
I live on the coast of North Carolina and have recently discovered many
hermit crabs on the beach. I have been unlucky in being able to determine what
species of hermit crabs these are, and cannot find any website regarding native
hermit crab species here in NC.
<Your best bet is to contact a local public aquarium or go to the library
searching for books on native animals.>
From what I have gathered, there are aquatic and land hermit crabs.
<Correct>
I would imagine that these are aquatic types, but my 9 year old insists that
they are Ecuadorian Hermit Crabs because he has seen them on the internet
somewhere. Do you have any ideas of what types live out here and would wash up
on the beach?
<No, not really, just that they are temperate species, need cold water and if
indeed are aquatic, they will perish in a room temperature tank.>
The crabs are brownish in color and have equal sized claws, rather small
compared to the purchased hermit crab claws I remember from when I was a kid.
Thank you for any information you can provide me.
<See notes above. -Steven Pro>
-"Hairy" hermit crabs-
I just purchased two medium sized (approx 3" shells) "hairy
crabs" from my favorite fish store. These crabs wear shells on
their backs like the hermit crab, but the pet store called them "hairy
crabs".
<Oh, they're hermits all right. Very aggressive though!>
I have looked at everything I can find on the internet pertaining to these crabs
to no avail.
<Likely Dardanus megistos, but impossible to say w/out a picture.>
Since I rely on info I obtain from the internet to learn about new purchases I
am stumped by the lack of info on my crabs.
<This is one of those times when doing research before your purchase would
have been a great idea!>
I placed one crab in my 55g reef tank with LR and one coral. It also
has a large yellow tang, 7 assorted damsels, a brittle star and a
goby. Is the crab a danger to any of these already established
animals.
<To the smaller ones, yes.>
The other crab went into a 75g tank with a blue tang (approx 8") and a
carpet anemone.
<Should be fine in there but the blue tang is much to large for a 75. Please
find at least a 6' long home for it, it's a very large fish with large swimming
requirements.>
I am just stocking this tank as it's only 3 months old. If
these crabs are aggressive I will definitely take them back to the store and get
something more compatible for my tanks.
<You may be better off bringing them back.>
Also since they seem to be of the hermit family should I keep several larger
shells available for them to use as homes.
<Yes>
Thanks for all the info your website brings to those of us who are less than
marine biologists.
<You're very welcome, but that would include me as well! -Kevin>
Janie
Hermit crab hitchhikers: Hydroids - 7/14/03
What's this growing on the hermit crab's shell? Please don't tell me it's
Aiptasia.
<no worries.. or at least, they are not Aiptasia. They are hydroids...
and quite a handsome colony at that. Yet - they can be fiercely stinging
and no less formidable to other invertebrates as Aiptasia>
I do have 3 Aiptasia in a new tank that I have just begun to stock, but
they don't look like this.
<no worries about your glass anemones either... they only flourish in
tanks with nutrient control problems (poor skimming, poor water flow,
overfeeding, etc)>
The ones I know that are Aiptasia are0.25-0.5cm across, brown and look
just like the pictures on your site. The ones in the attached photo are
much smaller, clear and growing like shaggy hair on their transport.
Thanks.
<do enjoy them in the meantime... a fascinating creature and one that
will behave if you maintain proper water quality. Anthony> |
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- Louisiana Hermit Crab ID -
I am trying to find out about some hermit crabs my daughter brought home
from Grand Isle Louisiana. Their claws are the same size, and legs have a dark
color possibly black with a lighter color possible yellow or white running
parallel to one another. They look like they stay in the water usually because
their shells have barnacles on them. With this information could you tell me
what kind of hermit crab these are and how to care for them? <Well, I can't
be 100% certain what type of hermit crab they are, but there's a possibility it
is Clibanarius vittatus, the Thin stripe Hermit, which seems to be common around
the Gulf Coast states. As for care, I think you could likely keep them in
typical marine conditions, similar to saltwater fish. You probably wouldn't want
to heat the water too much, but ideally match the conditions to those of the
waters of the Grand Isle.>
Thank you,
the dad that just don't Know
<Cheers, J -- >
Anemone hermits
I think I have a pair of anemone hermits in my tank. They came in with the blue legs at my LFS, and I thought they were cool so I bought them. They are black and white and larger then my blue legs, the largest being the dominant and the small just pushes everybody around, or runs over them without a care. I have a book on hermits, though it's a bit dated, and it mentions the black and white legs as being indicative of an anemone hermit. I love my little hermits, they are fun to watch, but these two seem to have a problem, they came without anemones. I have watched the largest rub up
against my "flower anemone" (no idea what it really is) several times and poke it to close so he could attach it. Well the anemone is about 4 or 5 inches in diameter and the hermit shell and all is only about 1/2 an inch. I think that the loss of my smallest
Condylactis anemone was due to the same treatment, he'd already been abused by the biggest anemone earlier.
So I guess my question is do I really have anemone hermits, what kind of anemone do they need, and how do I
acquire the proper species of anemone.
<Hmm, can't tell the species of Hermit from the description. Please take a look at the few species shown on our scant coverage: http://wetwebmedia.com/hermitcrabs.htm
And maybe search the internet through your search engines under the names by genera of hermits... And ask your livestock suppliers to look for live rock, other hard based organisms from the region of origin of your Hermits to see if they can find "recruits" (contaminant) anemones on these>
How long before they get to big for a 60 gal FOWLER (with a few inverts on the side) tank.
<Maybe weeks, months... perhaps never>
I have some dragonets and I have heard that hermits have a taste for these cute little fish (my friend lost her mandarin to a large hermit)
<They have more cosmopolitan tastes... eating most anything they can grab>
like I said earlier, they are pretty small, but since I got them a couple of months ago they have shed once and changed shells numerous times (there are a lot of shells in there and apparently they have to try them all!!)
Thank you for all your help once again.
Kim
<Enjoy these animals... keep them well fed... and keep an eye on them! Bob Fenner>
What type of snail is this (actually Hermit Crab)
I went to the LFS to get some blue legged hermits. I am not sure what in
the heck these are can you help?
<Mmm, not to species... do seem to be of the family Diogenidae, possibly genus Dardanus>
Are they safe for corals and snails?
<Mmm, not very. Please read: http://www.wetwebmedia.com/hermitcrabs.htm>
Thanks! Also, I included two other photos. I think it is either red slime
algae or maroon coralline?
<Please read through the marine algae sections posted on WetWebMedia.com
Bob Fenner>
Please let me know what you think. The tank is
only a month old.
Adam |
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Red Legged Hermit Crabs
Dear Bob,
After looking over the site, you wrote about Dardanus megistos (sp?) as a
type of Red Legged Hermit that controls Aiptasia. I have several "Scarlet
Reef Hermits" in my 125 FOWLR and DSB. I tried a search but came up empty on
the net. Are the Scarlet Reef Hermits the same?
<Mmm, no... the latter are almost always Paguristes cadenati... Bob Fenner>
Thank you,
Jeff
Blue leg hermit crab?
Hi
http://www.reefclub.or.kr/forums/showthread.php?s=dad061220736b909342997c6r=1
(language is Korean, so you can't read it, but you can see the picture)
this is not blue leg hermit crab?
no reef safe?
what kind of this hermit crab?
<Don't know this species. Not found in my reference works. Will post in hopes that others may identify, offer input. Most Hermits are not carte blanche "reef safe". Would pass on this one if you did not find, feel it is more toward that end of the spectrum. Please read here: http://www.wetwebmedia.com/marine/inverts/arthropoda/crabs/hermitcrabs.htm and the FAQs beyond. Bob Fenner>
thanks in advance. |
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