Homostichanthidae with rather elongate body the distal part of which is much folded. Margin somewhat crenulated, fosse slight. Sphincter very weak, restricted. Tentacles very short, smooth, slightly capitate with numerous basitrichs in their tips, arranged in a single row over each endo- and exocoel their longitudinal muscles ectodermal. 2 well developed siphonoglyphs. Numerous perfect pairs of mesenteries, many with diffuse retractors. Parietobasilar muscles well developed. All stronger mesenteries fertile. Considerably more mesenteries distally than proximally. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
H. duerdeni Carlgren 1900
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1