Hemicrustacea

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Hemicrustacea

 

a class of ancient, extinct, primitive arthropods. They were common from the Cambrian period to the Permian period. Outwardly they resembled the Cladocera and Notostraca. A solid spinal shield and a rodlike or lamellate caudal spine (a telson) were characteristic of the Hemi-crustacea. There were approximately ten genera. They lived in water.

REFERENCE

Osnovy paleontologii: Chlenistonogie—Trilobitoobraznye i rakoo-braznye. Moscow, 1960. Page 197.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.