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marginal and peripetalous fascioles separate around entire test; may be lost in development.
Range
Paleocene to Recent; widespread.
Remarks
As pointed out by Chesher (1968) and Markov & Solovjev (2001), the two families Pericosmidae and Paleopneustidae share a similar pattern of fasciole development, and both have occluded plates at the tips of the petals. No other member of the Paleopneustina has occluded elements, so taxa without fascioles as adults can be assigned. Mundaster is the only other taxon with separate marginal and peripetalous fascioles, but this taxon has an ethmophract apical disc and no occluded plates.
Chesher, R. H. 1968. The systematics of sympatric species in West Indian spatangoids: a revision of the genera Brissopsis, Plethotaenia, Paleopneustes, and Saviniaster. Studies in Tropical Oceanography7, 1-168, pls 1-35.
Markov, A. V. & Solovjev, A. N. 2001. Echinoids of the family Paleopneustidae (Echinoidea, Spatangoida): morphology, taxonomy, phylogeny. Geos2001, 1-109.