Actinodendronidae Haddon 1898 p. 488
Thenaria (Endomyaria) with well developed basal disc.
Column smooth. No sphincter. Oral disc thrown into long, tentacle-like
arms (lobes) which up to 48 in number are cyclically arranged, and bear
either dendritic tentacles or conical, simple ones. Tentacles with large
nematocysts. 2 well developed siphonoglyphs. Pairs of mesenteries up to
48, all or almost all perfect and, apart from the directives, fertile.
Retractors diffuse, broad, band-like. Parietobasilar and basilar muscles
distinct. Cnidom: spirocysts, basitrichs.
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.