Revision of Halisiphonia Allman, 1888 (Cnidaria, Hydrozoa, Hebellidae), with comments on its taxonomic position.

The deep‐water genus Halisiphonia is reviewed, based on redescriptions of all available type specimens of its species. The genus includes four valid species, H. arctica , H. galatheae , H. megalotheca , and H. nana , and one species inquirenda , H. spongicola , for which the type could not be located. [ABSTRACT FROM AUTHOR]