The equivalent name for Mesosauria.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a subclass of fossil aquatic lizard-like reptiles. Their relationship to other groups of reptiles is not clear. The Proganosauria are represented by a single order of Mesosauria.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.