Actiniidae with smooth column which has more or less distinct longitudinal rows of spots (nematocyst batteries or suckers?). Fosse slightly developed. At the margin large, club-shaped marginal spherules, between them pseudospherules. Sphincter diffuse. Tentacles not very long, their longitudinal muscles ectodermal. Radial muscles of oral disc ectodermal. 2 siphonoglyphs. Mesenteries rather few, not more numerous at the base than at the margin. 2 pairs of directives. Mesenteries of the first and second orders perfect. All mesenteries, save the directives and the weakest ones, fertile. Retractors diffuse. Parietobasilar muscles rather strong basilar muscles rather weak. Cnidom: spirocysts, atrichs, basitrichs, microbasic p-mastigophors.
A. Stephensoni [sic] Carlgren 1938
?Isactinia badia Carlgren 1900
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.