"Hydractinia " colonies are either male or female, and sexes are probably genetically determined.
2.
In the shallow waters, where " Hydractinia " are found, colonies release gametes on a light cue.
3.
Japan's Emperor Hirohito, who was also a marine biologist, actually named a hydroid, " Hydractinia bayeri ", in honor of Frederick Bayer.
4.
""'Hydractinia echinata " "'is a colonial marine hydroid which is often found growing on dead, hermit-crabbed shells of marine gastropod species.
5.
For example, the Japanese hermit crab, " Eupagurus constans ", has the hydroid " Hydractinia sodalis " growing all over the shell that it lives in.
6.
""'Hydractinia " "'is a genus of commensal athecate hydroids which belong to the family Hydractiniidae . " Hydratinia " species mostly live on hermit-crabbed marine gastropod shells.
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