Holectypidae

Holectypidae

[hō‚lek′tip·ə‚dē]
(paleontology)
A family of extinct exocyclic Euechinoidea in the order Holectypoida; individuals are hemispherical.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Among the early Holectypidae and Pygasteridae the test was