Amniota

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noun

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higher vertebrates (reptiles, birds and mammals) possessing an amnion during development

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None of the existing specimens shows enough detail to ascertain the phalangeal formula, but, based on other examples of Rhynchosauroides, the phalangeal formulae for both manus and pes are probably 2-3-4-5-3 (e.g., Baird 1957), which is the plesiomorphic count for Amniota. The manus is distinctly smaller than the pes, however, and this appears to be a synapomorphy for Diapsida.

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental Tetrapod assemblages from the Fundy rift basin, eastern Canada

Similarities occur in the initial development stages of the copulatory organs in reptiles and mammals, which suggests that the standard of differentiation of a single penis is a basal trait in Amniota (REINAND; PIEAU, 1998 apud RIEPPEL, 2000).

Anatomy of the male reproductive system of Phrynops geoffroanus (Testudines: Chelidae)/Anatomia do aparelho reprodutor masculino de Phrynops geoffroanus (Testudines: Chelidae)

(1997): A reassessment of Eunotosaurus africanus Seeley (Amniota: Parareptilia).

The phylogenetic position of Nyctiphruretus acudens, a parareptile from the Permian of Russia/Posicion filogenetica de Nyctiphruretus acudens, un parareptil del Permico de Rusia

For the analysis, Rieppel and deBraga compiled an extensive data matrix for amniota (reptiles, birds, and mammals) that included 33 amniote groups and 168 characteristics of their bones -- an important physical characteristic in defining clades.

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