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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 2

To: Part 1, Part 3, Part 4


by Bob Fenner  

Genus Halocordyle:

Halocordyle disticha, the Christmas Tree Hydroid. Branches alternately arranged on single stalks in colonies. Bearing prominent white polyps at ends like Xmas ornaments. To three and a half inches in height. St. Lucia pix.

Bigger PIX:
The images in this table are linked to large (desktop size) copies. Click on "framed" images to go to the larger size.

Genus Halopteris:
Halopteris carinata. 2-4 inches. Long stalks with alternating side branches. Tropical West Atlantic. Cozumel pic.

Bigger PIX:
The images in this table are linked to large (desktop size) copies. Click on "framed" images to go to the larger size.


Genus Lytocarpus:
Lytocarpus sp. (family Plumulariidae). N. Sulawesi image. 

Stinging Hydroid. Lytocarpus nuttingi. 4-12 inches in size branches... stinging... Puerto Vallarta 2015


Genus Macrorhynchia:
Macrorhynchia philippina Kirchenpauer 1872. Fire or Stinging Hydroid. Branching feathers of equal length up to 15 cm. long. Dark stems w/ contrasting polyps. Very painful to touch. Circumtropical. Fiji 2017

Macrorhynchia robusta. Cozumel 2014

To: Part 1, Part 3, Part 4

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