Thenaria (Acontiaria) with no sphincter or a weak endodermal one. Never atrichs, holotrichs and macrobasic amastigophors in the tentacles. Acontia with basitrichs and microbasic p-mastigophors?
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.