Halcampidae with no distinct external differentiation of capitulum, scapus and physa. Aboral end rounded, physa-like, at least sometimes without stinging warts. Other parts of the column, except the region of the upper sphincter, with longitudinal rows of stinging warts, which in the lower part are more scattered. 2 mesogloeal sphincters, the one close to the base of the tentacles, the other in the upper region of the column. Tentacles 12 or more, in the contracted state short, but stout and cylindrical. 2 siphonoglyphs and 2 pairs of directives. 6 pairs of macrocnemes, at least 8 mesenteries fertile, microcnemes weak. Retractors of the macrocnemes strong, restricted. Parietal muscles very weak. Cnidom: unknown.
Phytocoetes chilkaea Annandale 1915
Halianthus limnicola Annandale 1915
Definitions and contained taxa are those of Oscar Carlgren
as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series
4, Volume 1, Number 1