Ptychodactiidae the column of which is provided with 24 vertical rows of vesicle-like outgrowths. Sphincter very weak, diffuse. Tentacles 24 short. Actinopharynx well developed, with two distinct siphonoglyphs and with pocket like prolongations between some of the mesenteries. 12 pairs of mesenteries, six pairs or all of them perfect, all fusing together in the gonadial region in such a way that only small apertures remain in the axis of the animals.
Cystiactis antarcticus Clubb 1908
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1Electronic version made possible by NSF grant DEB95-21819 in the PEET program to D. G. Fautin.