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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. 

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Genus Rapharia:

Rapharia gorgonia, 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. 

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Genus Sertularella:

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

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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.

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To: Part 1, Part 2, Part 4

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