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Prosantosaurus scheffoldi
Taxonomy
Prosantosaurus scheffoldi was named by Klein et al. (2022). Its type specimen is PIMUZ A/III 1274, a skeleton, and it is a 3D body fossil. Its type locality is Ducanfurgga 4, which is in a Fassanian basinal (carbonate) lime mudstone in the Prosanto Formation of Switzerland. It is the type species of Prosantosaurus.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Prosantosaurus scheffoldi Klein et al. p. 11 figs. Figs. 2-5 |
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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.
†Prosantosaurus scheffoldi Klein et al. 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. Klein et al. 2022 | Prosantosaurus scheffoldi gen. et spec. nov. is a medium- sized pachypleurosaur with the following unique char- acter combination in its skull morphology: premaxilla excluded from contact with the external and internal nares; small (reduced) parietal that is longer than wide; parietal with narrow posterior shelf, centrally situated parietal foramen, and distinct, anterolaterally angled process accommodating the posterior process of the postfrontal in a triangular facet; posterior skull margin is deeply emarginated due to a far posterior extension of the squamosal to the posterolateral margin of the pari- etal; constricted temporal region; pterygoid with trian- gular anterior shelf tapering anteriorly, broad mid-part region, and strongly waisted posterior end with massive lateral extending posterior processes. The new taxon is further distinguishable by the combination of the follow- ing postcranial characters: proximally and distally equally broadened sacral ribs with a narrower shaft; gastralia composed of five elements; no pachyostosis in ribs or any other elements.
According to the results of our phylogenetic analyses, the new taxon thus differs by the combination of the fol- lowing characters from all other European pachypleuro- saurs: by the lack of a distinct anterolateral process(es) entering between the prefrontal and the nasal (character 10); the exclusion of the premaxilla from contact with the internal and external naris (character 12); a straight lateral edge of the frontal (character 15); a ventral pro- cess of the postfrontal that encompasses the dorsal tip of the postorbital at the dorsoposterior margin of the orbit (character 16); a broad and rounded anteromedial process of the postorbital that overlies the postfrontal (character 17); an anteromedial process of the postorbital that articulates on the postfrontal anterolaterally (charac- ter 18); the maxillary tooth row extending to or over the posterior orbit (character 31), and by a subequal length of the preorbital and postorbital regions of skull (character 76). |
Measurements
No measurements are available
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| Source: subo = suborder, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Kiessling 2004, Bush and Bambach 2015 | |||||