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Tessellatia bonapartei
Taxonomy
Tessellatia bonapartei was named by Gaetano et al. (2022). Its type specimen is PULR-V121, a partial skull (partial cranium, represented by the snout and orbital region, with associated lower jaws.), and it is a 3D body fossil. Its type locality is La Esquina cynodont, which is in a Norian floodplain mudstone in the Los Colorados Formation of Argentina. It is the type species of Tessellatia.
Synonymy list
| Year | Name and author |
|---|---|
| 2022 | Tessellatia bonapartei Gaetano et al. p. 2 fig. 2 |
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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.
†Tessellatia bonapartei Gaetano et al. 2022
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. C. Gaetano et al. 2022 | Small probainognathian with the antorbital region notably longer than the height of the skull at the level of the anterior margin of the orbit. Autapomorphies of Tessellatia bonapartei are: masseteric fossa and low coronoid process posterior to the lower tooth row; angular process ventrally projected, well-developed, and semicircular in outline; broad groove between the lateral wall of the dentary and the postcanine alveoli; and upper postcanine count larger (14) than the lower postcanines (7), with the last six upper postcanines lacking an opposing lower tooth. Differs from other non-mammaliaform cynodonts except Riograndia guaibensis and the early mammaliaform Morganucodon in the presence of a large upper canine and a small lower canine. Differs from other non-mammaliaform probainognathians (except Aleodon cromptoni, Prozostrodon brasiliensis, Pseudotherium argentinus, and Tritylodon longaevus) in the subequal contribution to the secondary bony palate of the maxilla and palatine. Shares with many derived non-tritylodontid probainognathians and the mammaliaform Morganucodon an anteriorly elevated alveolar margin of the dentary. Shares with some derived probainognathians traditionally grouped in Tritheledontidae (Chaliminia musteloides, Elliotherium kersteni, Irajatherium hernandezi, and Pachygenelus monus), the presence of a ventrally bowed bony secondary palate with deep, narrow, lateral groove for the lower postcanines; posterior upper postcanines with convex labial and concave lingual surfaces, and bearing a centrally placed, symmetrical main cusp with convex mesial and distal margins flanked by smaller, lingually placed accessory cusps; and lower postcanines, comparatively larger than uppers, with a large, asymmetrical, mesial main cusp followed by smaller distal accessory cusps. Differs from Chaliminia musteloides, the only other named cynodont known from the Los Colorados Formation, in having the alveolar margin of the maxilla sigmoidal, with its dorsal-most point at the level of the canine; the horizontal ramus of the dentary comparatively low and lacking a well-developed platform lateral to the posterior postcanines; and the posteriormost lower incisor smaller than the canines and postcanines. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||