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Related FAQs: Hydrozoans, Hydrozoans 2, Hydrozoan Identification, Hydrozoan ID 2, Hydrozoan ID 3, Hydrozoan ID 4, Hydrozoan ID 5, Hydrozoan ID 6, Hydrozoan ID 7, Hydrozoan ID 8, & Hydrozoan Behavior, Hydrozoan Compatibility, Hydrozoan Selection, Hydrozoan Systems, Hydrozoan Feeding, Hydrozoan Disease, Hydrozoan Reproduction, Medusoids/Jellies (Ctenophores, some Hydrozoans, Scyphozoans): Jelly Identification, Jelly Behavior, Jelly Compatibility, Jelly Selection, Jelly Systems, Jelly Feeding, Jelly Disease, Jelly Reproduction, Fire Corals Lace Corals, Stinging-celled Animals

Related Articles: Cnidarians, Fire Corals, Stylasterines, Hydrozoan Jellies, Water Flow, How Much is Enough,

Not Corals! But Still Stinging-Celled Animals: The Hydrozoans, Part 3

To: Part 1, Part 2, Part 4


by Bob Fenner  

Genus Pennaria:
Pennaria disticha Goldfuss 1820. Cosmopolitan in tropical, temperate seas. To 12 cm. in height. Urn-shaped polyps are born on upper sides of immediately alternating branches. N. Sulawesi and Nuka Hiva, Marquesas images. 


Genus Rapharia:

Rapharia gorgoniae, Solitary Gorgonian Hydroid. Size: 1/4-1 in. diameter. Singular polyps with thin, clearish tentacles. Usually found attached to sea fans, particularly Sea Plumes (Pseudopterogorgia). Cozumel pic by Di. 


Sertularella speciosa, Branching Hydroid. Branches alternate in single plane per stalk, with white polyps alternating. Solitary or colonial. 

Verticals (Full/Cover Page Sizes Available
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The images in this table are linked to large (desktop size) copies. Click on "framed" images to go to the larger size.


Genus Thyroscyphus:

Thyroscyphus ramosus, the Algae Hydroid. Uneven alternately arrayed branches, often covered by algae. "Clean" in St. Lucia, and more typical appearance in Belize and a close-up in Cozumel.

Verticals (Full/Cover Page Sizes Available
Bigger PIX:
The images in this table are linked to large (desktop size) copies. Click on "framed" images to go to the larger size.

To: Part 1, Part 2, Part 4


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