Sanamyan N.P., Sanamyan K.E. 2007. Deep-water Actiniaria from East Pacific hydrothermal vents and cold seeps // Invertebrate Zoology. Vol.4. No.1: 83–102 [in English].

Kamchatka Branch of the Pacific Institute of Geography FEB RAS, Partizanskaya 6, Petropavlovsk-Kamchatsky 683000, Russia. E-mail:

doi: 10.15298/invertzool.04.1.07

KEY WORDS: Actiniaria, Anthozoa, Cnidaria, hydrothermal vents, cold seeps, deep-water fauna.

ABSTRACT: Four species of sea anemones from East Pacific hydrothermal vents and one species from cold seeps are discussed. A species from cold seeps, Seepactis galkini gen. nov., sp. nov, possesses acontia and belongs to Kadosactiidae. Previously the specimens of this species were preliminarily referred to the ultraabyssal actinostolid Hadalanthus knudseni. Cyananthea hydrothermala, an obligate hydrothermal species and genus known previously only from an incomplete damaged specimen is redescribed and tentatively assigned to the Actinoscyphiidae. Cyananthea is closely related to several monotypic genera described recently from hydrothermal vents, especially to Pacmanactis and Marianactis which were assigned to the Actinostolidae by their authors. In our opinion these genera should be removed from the Actinostolidae and placed in the same family as Cyananthea. Three other recorded species belong to the Hormathiidae: Phelliactis hydrothermala sp.n., Phelliactis callicyclus and Paraphelliactis pabista.

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