Serehyba Sanctisebastiani n. gen., n. sp. (Hydrozoa, Tubulariidae), Symbiont of a Gorgonian Octocoral from the Southeast Coast of Brazil

Abstract
An athecate hydrozoan, Serehyba sanctisebastiani, representing a new genus, is described. It possesses gonosomes with a cormidium-like structure unique among tubulariids: a distal set of branched nematophores and a proximal gonodendron. S. sanctisebastiani is apparently transitional between the families Tubulariidae and Corymorphidae. It is a symbiont of the gorgonian octocoral Lophogorgia punicea (Milne Edwards & Haime, 1857).

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