Taxa included

Firstman, B. (1973). The relationship of the chelicerate arterial system to the evolution of the endosternite. Journal of Arachnology 1: 1–54.

Taxon
Pseudocellus boneti (Bolívar y Pieltain, 1942) (Ricinulei: Ricinoididae) 5, 18, figs 11a–b, Cryptocellus boneti
Pseudocellus osorioi (Bolívar y Pieltain, 1946) (Ricinulei: Ricinoididae) 5, 18, Cryptocellus osorioi