Plesiocidaroida

Plesiocidaroida

[‚plē·sē·ō‚sik·ə′rȯid·ə]
(paleontology)
An extinct order of echinoderms assigned to the Euechinoidea.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.