Halcampoididae with elongate, smooth body without papillae, not distinctly divisible into regions. Aboral end rounded or somewhat flattened. No sphincter. Tentacles more than 12, not swollen at the apex. Siphonoglyphs indistinct. 6 pairs of perfect and fertile mesenteries with strong, restricted retractors. Sterile microcnemes in the upper part of the body. Parietal muscles weak, elongate. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
Actinia intestinalis Fabricius 1780
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.