Cyclosteroidea

Cyclosteroidea

[¦sī·klō·stə′rȯid·ē·ə]
(paleontology)
A class of Middle Ordovician to Middle Devonian echinoderms in the subphylum Echinozoa.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.