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Genus Sertularia
- sessile hydroid that forms feathery colonies
Genus Actinia
- a genus of sea anemone common in rock pools
Genus Pennatula
- type genus of the family Pennatulidae: sea pens
Genus Acropora
- coelenterate genus of order Madreporaria, including staghorn corals
Genus Fungia
- a genus comprising the usual mushroom corals
Genus Beroe
- coextensive with the class Nuda
Genus Sagitta
- chief genus of Chaetognatha including the largest arrowworms