Eocene Periphragnis enters the LRT alongside enigmatic Thomashuxleya
This ‘traditional’ notoungulate
(a traditional clade previously invalidated in 2016 by the large reptile tree (LRT, 2183 taxa) Periphragnis (Fig 1) is another marsupial interathere close to Eocene Thomashuxleya (Fig 2).
Periphragnis exauctus
(Roth 1899 (genus), Ameghino 1902 (species), Middle Eocene to Early Oligocene; 1.5m long), is traditionally considered very close to Thomashuxleya. Here Periphragnis has a smaller skull with a shorter snout and five hoof-like unguals on all four extremities, but still nests close to Thomashuxleya.
References
Ameghino F 1902. Cuadro sinoptico de las formaciones sedimentarias terciarias y cretacicas de la Argentina, en relacion con el desarrollo y descendencia de los mamiferos. An. Mus. Nac. Hist. Nat., vol. 8, pp. 1-12.
Roth S 1899. Aviso preliminar sobre mamíferos mesozoicos encontrados en Patagonia. Revista del Museo de La Plata 9: 381–388.
Notogungulate expert, Darin A Croft, PhD
has a website in which he discusses this clade.
wiki/Thomashuxleya
wiki/Periphragnis
Source: https://pterosaurheresies.wordpress.com/2022/12/16/eocene-periphragnis-enters-the-lrt-alongside-enigmatic-thomashuxleya/
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