Quick Reference

(class Crinoidea)

Subclass of echinoderms (Echinodermata), with thecal plates typically united by rigid structures composed of numerous small, polygonal plates, and some lower brachial plates, all the plates firmly sutured together. The tegmen is plated, some of the plates roofing over the mouth and ambulacral grooves. The Camerata are known from the Lower Ordovician to Upper Permian.

Subjects: Earth Sciences and Geography.

Reference entries