Mortensen (1950) recognized that Heterobrissus was probably a senior synonym, but chose to retain the name Archaeopneustes for the Recent species because the type species of Archaeopneustes was much better known and had a slightly more inframarginal periproct. However, Stefanini (1908) refigured the type of Heterobrissus and showed its periproct to be inframarginal, as in Archaeopneustes. Consequently, there seems to be no basis for separating this taxon from Archaeopneustes.
Gregory, J. W. 1892. Archaeopneustes abruptus, a new genus and species of Echinoid from the Oceanic Series in Barbados. Quarterly Journal of the Geological Society, 48, 163–169.
Mortensen, T. 1950. A monograph of the Echinoidea. V Spatangoida 1. C. A. Reitzel, Copenhagen.