Halcampidae with the body divisible into scapus and scapulus, the former with a cuticle, which is sometimes thin and easily deciduous. Aboral end rarely rounded, as a rule adherent and flattened into the form of a pedal disc, but without basilar muscles. Scapus without batteries of nematocysts. 2 sphincters, the upper rather short, close to the tentacles, the lower long. Tentacles rather long the same in number as the mesenteries. Longitudinal muscles of tentacles and radial muscles of oral disc ectodermal. 2 weak siphonoglyphs. 6 pairs of macrocnemes, 2 pairs of directives, 6 pairs of microcnemes. Retractors of the macrocnemes very strong, restricted, reniform to circumscribed. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
Edwardsia kerguelensis Studer 1878
H. annularis Carlgren 1938
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1