Archaeocidaridae

Archaeocidaridae

[‚ärk·ē·ə‚sə′dar·ə‚dē]
(paleontology)
A family of Carboniferous echinoderms in the order Cidaroida characterized by a flexible test and more than two columns of interambulacral plates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.