Parablastoidea

Updated About encyclopedia.com content Print Article Share Article
views updated

Parablastoidea (subphylum Pelmatozoa) A class of echinoderms (Echinodermata) restricted to the Lower and Middle Ordovician, which had biserial brachioles, well-developed pentameral symmetry, and ambulacra composed of biserial plates.

More From Encyclopedia.com


You Might Also Like