Thenaria (Endomyaria) with a broad pedal disc. Column with simple or compound vesicles or with outgrowths which are branched in their ends. Vesicles may also occur on the branches, and peduncles of the outgrowths. Vesicles with macrobasic amastigophors. The smooth upper part of the column may have weak longitudinal muscles, and spots containing spirocysts and few nematocysts. No distinct sphincter. Margin tentaculate. Tentacles long to rather long with spots as in the upper part of the column. Longitudinal muscles of tentacles and radial muscles of oral disc ectodermal. 2 siphonoglyphs. Pairs of perfect mesenteries 6, sterile or fertile. 2 pairs of directives. Retractors weak or rather strong but always diffuse. Basilar muscles weak or well developed.
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.