Diploporita

Diploporita

[‚dip·lə′pȯr·əd·ə]
(paleontology)
An extinct order of echinoderms in the class Cystoidea in which the thecal canals were associated in pairs.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.