Actinodiscidae with straight or somewhat irregular, not lobed margin. Sphincter diffuse, very weak or only indicated. Tentacles simple, short, often wart-like, not swollen at their apex [sic], sometimes rudimentary and then not reaching the surface of the oral disc. Marginal tentacles not dicyclic, externally almost agreeing with the discal tentacles but often (always?) histologically differentiated from these. Imperfect longitudinal division resulting in 2 or more mouths does not seem to occur. Cnidom: spirocysts, holotrichs (atrichs?), microbasic p-mastigophors.
Discosoma nummiformis Leuckart in Rueppel 1928
Discosoma Yuma [sic] Carlgren 1900
Discosoma Unguja [sic] Carlgren 1900
Discosoma dawydoffi Carlgren 1943
Discostoma [sic] fungiformis Verrill 1869
?Discosoma rubr-oris Saville Kent 1893
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.