ATTENTION: This is a Taxon that could easily tangled with Emys wyomingensis ( Echmatemys wyomingensis) has been named in Leidy (1869) based on a left epiplastron. One year later, Leidy (1870a) named Baptemys wyomingensis from the same locality, based on an almost complete shell (Leidy 1873, pl. 11). Leidy (1870a) raised some doubts on the validity of Emys wyomingensis by saying that the epiplastron could belong the same animal as Baptemys wyomingensis. I am not sure if by that he meant the same individual or the same species, but the epiplastron of Emys wyomingensis is certainly a pan-testudinoid and clearly distinct from Baptemys. In the same year, Cope (186970) already suggested the synonymy between the two species, and placed them under Adocus. But shortly after, Leidy (1873) and Hay (1908) provided further evidence on the distinction of these two species. However, in the literature these taxa often get confused.

Alternative combination: Adocus wyomingensis

Synonyms: Baena ponderosa Cope 1873, Baptemys fluviatilis Hay 1908

Full reference: J. Leidy. 1870. [Remarks on Poikilopleuron valens, Clidastes intermedius, Macrosaurus proriger, Baptemys wyomingensis, and Emys stevensonianus]. Proceedings of the Academy of Natural Sciences of Philadelphia 22(1):3-5

Sister taxa: none

Type specimens:

• Baptemys wyomingensis: ANSP 10074, a partial shell (epiplastron). Its type locality is A few miles from Fort Bridger, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
• Baena ponderosa: USNM 4056, a partial shell. Its type locality is Hams Fork, which is in a Bridgerian terrestrial horizon in Wyoming.
• Baptemys fluviatilis: AMNH 4913, a partial shell (a mass of gray sandstone, broken into two pieces, which bears considerable portions of the carapace and impressions of other portions and a fragment of the plas).

Distribution:

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Specimen images are retrieved through the ePANDDA API.