Perischoechinoidea | Article about Perischoechinoidea by The Free Dictionary
A subclass of principally extinct echinoderms belonging to the Echinoidea and lacking stability in the number of columns of plates that make up the ambulacra and interambulacra.
References in periodicals archive
The Cidaroida, the only extant order of the subclass Perischoechinoidea
, is the lineage most divergent from all other echinoids.
Echinoidea: SCB, in the form of short rods, were found in Goniocidaris umbraculum, a representative of the primitive subclass Perischoechinoidea