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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Simplicidentata
a suborder of rodents. After a second suborder of rodents, Duplicidentata, was reclassified as the order Lagomorpha, there was no further need for the term “Simplicidentata.”
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.