Overview

Perischoechinoidea


'Perischoechinoidea' can also refer to...

 

More Like This

Show all results sharing this subject:

  • Zoology and Animal Sciences

GO

Show Summary Details

Quick Reference

(subphylum Echinozoa, class Echinoidea)

A subclass of regular echinoids, without compound plates, in which the perignathic girdle is absent or of apophyses only, the teeth are grooved, and there are no gill slits or spheridia. The number of columns of plates in ambulacra and interambulacra is very variable except in Cidaroida. These echinoids first appeared in the Ordovician.

Subjects: Zoology and Animal Sciences.


Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.