Echmatemys wyomingensis Leidy 1869 (turtle)

Reptilia - Testudines - Pangeoemydidae

ATTENTION: Tangled Taxon > Emys wyomingensis (= Echmatemys wyomingensis) has been named in Leidy (1869) based on a left epiplastron (see above). 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 (1869–70) 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.

Synonym: Echmatemys uintensis Hay 1908

Full reference: J. Leidy. 1869. Notice of some extinct vertebrates from Wyoming and Dakota. Proceedings of the Academy of Natural Sciences of Philadelphia 21:63-67

Belongs to Echmatemys according to E. Vlachos 2018

See also Gilmore 1915 and Hay 1908

Sister taxa: Echmatemys arethusa, Echmatemys callopyge, Echmatemys cibollensis, Echmatemys depressa, Echmatemys haydeni, Echmatemys jeanesi, Echmatemys lativertebralis, Echmatemys naomi, Echmatemys stevensoniana, Palaeotheca polycypha, Palaeotheca terrestris

Type specimens:

  • Echmatemys 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.
  • Echmatemys uintensis:

Ecology: aquatic herbivore


• Eocene of United States (4: Wyoming collections)

Total: 4 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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