2024
DOI: 10.1002/ar.25388
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A new early‐diverging probainognathian cynodont and a revision of the occurrence of cf. Aleodon from the Chañares Formation, northwestern Argentina: New clues on the faunistic composition of the latest Middle–?earliest Late Triassic Tarjadia Assemblage Zone

Agustín G. Martinelli,
Martín D. Ezcurra,
Lucas E. Fiorelli
et al.

Abstract: The Chañares Formation (Ischigualasto‐Villa Unión Basin) is worldwide known by its exquisitely preserved fossil record of latest Middle‐to‐early Late Triassic tetrapods, including erpetosuchids, “rauisuchians,” proterochampsids, gracilisuchids, dinosauromorphs, pterosauromorphs, kannemeyeriiform dicynodonts, and traversodontid, chiniquodontid and probainognathid cynodonts, coming from the Tarjadia (bottom) and Massetognathus‐Chanaresuchus (top) Assemblage Zones of its lower member. Regarding cynodonts, most of… Show more

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Cited by 6 publications
(1 citation statement)
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“…In Brasilodon , the ridge formed by the fold of the anterior edge of the transverse lamina also would be associated with the anchorage of cartilage that closes the posterior region of the nasal cavity, analogous to the cribriform plate. We cannot state that this structure would be a direct precursor of the cribriform plate, but it is clear that this region is much more developed in Brasilodon than in other non-mammaliaform cynodonts, and Brasilodon is recovered as the sister taxon of mammaliaforms in most current phylogenetic hypotheses 71 73 , 114 116 . Furthermore, we observe that the topology of the roof of the nasal cavity of Morganucodon 81 is very similar in Brasilodon and, despite not having a specimen with the transverse lamina well preserved; we believe that the anchoring structures are similar.…”
Section: Discussionmentioning
confidence: 89%
“…In Brasilodon , the ridge formed by the fold of the anterior edge of the transverse lamina also would be associated with the anchorage of cartilage that closes the posterior region of the nasal cavity, analogous to the cribriform plate. We cannot state that this structure would be a direct precursor of the cribriform plate, but it is clear that this region is much more developed in Brasilodon than in other non-mammaliaform cynodonts, and Brasilodon is recovered as the sister taxon of mammaliaforms in most current phylogenetic hypotheses 71 73 , 114 116 . Furthermore, we observe that the topology of the roof of the nasal cavity of Morganucodon 81 is very similar in Brasilodon and, despite not having a specimen with the transverse lamina well preserved; we believe that the anchoring structures are similar.…”
Section: Discussionmentioning
confidence: 89%