Differs from all other Paleopnuestina except Periaster in having an ethmophract apical disc. Periaster is distinguished because its marginal fasciole crosses plate 5 (not plate 4 as in Mundaster) in interambulacra 1b and 4a, and lateroanal and peripetalous branches coalesce on that plate to give rise to a single anterior fasciole.
The taxon has been described and reillustrated by Markov & Solovjev (2001).
Markov, A. V. & Solovjev, A. N. 2001. Echinoids of the family Paleopneustidae (Echinoidea, Spatangoida): morphology, taxonomy, phylogeny. Geos 2001, 1-109.