A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma

A short scientific monograph documents the discovery and formal naming of a new emydid turtle from early Pliocene marl beds in Beaver County, Oklahoma. The author designates a fragmentary holotype and provides careful anatomical description of preserved carapace and plastron elements, noting sculpturing, ridges, scute sulci, and damage from preservation. Diagnostic features include a broadly concave anterior carapace, nonflared posterior plastron, and relatively greater width. Measurements and ratios are given, and the specimen is compared with Recent Chrysemys and Pseudemys and with other fossil emydids to justify its taxonomic placement.