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