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Psilosemys
Taxonomy
Psilosemys was named by Hutchison (2013). Its type is Psilosemys wyomingensis.
It was assigned to Emydidae by Hutchison (2013); and to Panemydidae by Vlachos (2018).
It was assigned to Emydidae by Hutchison (2013); and to Panemydidae by Vlachos (2018).
Species
P. wyomingensis (type species)
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. H. Hutchison 2013 | Psilosemys is included in the Testudinoidea
on the basis of the loss of extragular scales, extensive dorsal overlap of the plastral scales, broad plastron, loss of the inframarginals other than inguinal and axillary, and well developed axillary and inguinal buttresses. It is included in the Emydidae because of the absence of musk duct foramina, supracaudal marginals not extending onto the suprapygal (also occurs in a few batagurids; e.g., Joyce and Bell 2004), inframarginals reduced to two, normal hexagonal neurals 2–8 (also occurs in a few batagurids; e.g., Mauremys Gray 1869), and costal-inguinal buttress confined to C5. It differs from other emydids in the combination of plastral vertebral scale crossing lateral corners of nuchal, pectoral scale posterior to entoplastron, plastral buttress just reaching costals, carapace unsculptured or weakly so, C5 shorter distally than C6,; and inguinal small and narrow. Psilosemys resembles the Deirochelyinae and is excluded from the Emydinae on the basis of distinct lack of pectoral overlap of the entoplastron (one exception). |