Andresiidae of considerable length with rounded aboral end. Column smooth but with a notched parapet and a fosse at the margin. Sphincter small, circumscribed. Tentacles long, hexamerously arranged, not numerous, the inner longer than the outer ones. Longitudinal muscles of tentacles and radial muscles of oral disc ectodermal. 2 siphonoglyphs. 24 pairs of mesenteries, all perfect and fertile. 2 pairs of directives. Retractors diffuse. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
Ilyanthus parthenopea Andres 1880
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1
Electronic version made possible by NSF grant DEB95-21819 in the PEET program to D. G. Fautin.