Acrotretacea

Acrotretacea

[‚ak·rō·tre′tās·ē·ə]
(paleontology)
A family of Cambrian and Ordovician inarticulate brachipods of the suborder Acrotretidina.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.