Taxa included

Ax, P. (2001). Multicellular animals: the phylogenetic system of the Metazoa. Springer-Verlag, Berlin, Heidelberg, New York II.

Cryptocellus isthmius Cooke and Shadab, 1973 (Ricinulei: Ricinoididae) n/a, fig. 58a (as Cryptocellus isthmus [sic]), Cryptocellus isthmius
Ricinoides hanseni Legg, 1976 (Ricinulei: Ricinoididae) n/a, figs 58c, e, Ricinoides hanseni
Pseudocellus paradoxus (Cooke, 1972) (Ricinulei: Ricinoididae) n/a, fig. 58d, Pseudocellus paradoxus (Cooke)