Differs from Palaeotropus in having aboral pore-pairs in the paired ambulacra and biserial ambulacral plating continuing to the apex. Distinguished from Palaeotrema by its double pores in the aboral paired ambulacra. Palaeobrissus also lacks the enlarged primary tubercles bordering the frontal ambulacrum of those two genera. Close to Scrippsechinus, differing primarily in having ambulacra biserial to the apex.
The genus Cleistechinus de Loriol, though very poorly known, is possibly a junior synonym.
Agassiz, A. 1883. Memoirs of the Museum of Comparative Zoology, Harvard 10 (1), p. 56.
Mortensen, T. 1950. A Monograph of the Echinoidea. V. Spatangoida 1. C. A. Reitzel, Copenhagen.