Athenaria (Abasilaria) with elongate body, the aboral end physa-like. Sphincter small, endodermal circumscribed. Inner tentacles longer than the outer ones. No differentiation of mesenteries into macro-and microcnemes. Retractors diffuse.
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.