Pontognathus, new traversodontid cynodont from Late Triassic of Argentina (free pdf)
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Ben Creisler
Sep 3, 2025, 4:16:10 PM (4 days ago) Sep 3
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Ben Creisler
Pontognathus ignotus gen. et sp. nov.
Leandro Carlos Gaetano, Fernando Abdala, Adriana Cecilia Mancuso, Nahuel Vega, Cecilia Mancuso & Nahuel Vega (2025)
New traversodontid cynodont from the Late Triassic Chañares Formation
[Nuevo cinodonte traversodóntido del Triásico Tardío de la Formación Chañares]
Publicación Electrónica de la Asociación Paleontológica Argentina 25(2): 49–67
DOI: https://doi.org/10.5710/PEAPA.01.08.2025.540
https://peapaleontologica.org.ar/index.php/peapa/article/view/540
Free pdf:
https://peapaleontologica.org.ar/index.php/peapa/article/view/540/915
The Chañares Formation in north-western Argentina has provided an impressive number of specimens of early archosauriforms, dicynodonts, and non-mammaliamorph cynodonts. However, there is a very low diversity of cynognathian cynodonts. Herein, we report on Pontognathus ignotus gen. et sp. nov., a small new traversodontid from the traditional Late Triassic Carnian levels of the unit. It differs from other traversodontids for lacking a maxillary platform lateral to the posterior postcanines and by presenting a unique combination of characters from the premaxilla, maxilla, and dentition (i.e., the precanine diastema; the placement of the paracanine fossa; the number of upper postcanines; the general outline of the upper postcanines crown in occlusal view; the shouldering between adjacent teeth; the expansion of the crown distolateral to the sectorial crest; the extension, limits and deepness of the occlusal basin; the distal ridge-like bulging at the base of the crown; the number and relative placement and development of the cusps). It is a relatively small taxon inferred to have occupied a specialized, small herbivorous/omnivorous role, which in this fauna is otherwise only shared by small individuals of the traversodontid Massetognathus pascuali.
A new paper:
Free pdf:
Pontognathus ignotus gen. et sp. nov.
Leandro Carlos Gaetano, Fernando Abdala, Adriana Cecilia Mancuso, Nahuel Vega, Cecilia Mancuso & Nahuel Vega (2025)
New traversodontid cynodont from the Late Triassic Chañares Formation
[Nuevo cinodonte traversodóntido del Triásico Tardío de la Formación Chañares]
Publicación Electrónica de la Asociación Paleontológica Argentina 25(2): 49–67
DOI: https://doi.org/10.5710/PEAPA.01.08.2025.540
https://peapaleontologica.org.ar/index.php/peapa/article/view/540
Free pdf:
https://peapaleontologica.org.ar/index.php/peapa/article/view/540/915
The Chañares Formation in north-western Argentina has provided an impressive number of specimens of early archosauriforms, dicynodonts, and non-mammaliamorph cynodonts. However, there is a very low diversity of cynognathian cynodonts. Herein, we report on Pontognathus ignotus gen. et sp. nov., a small new traversodontid from the traditional Late Triassic Carnian levels of the unit. It differs from other traversodontids for lacking a maxillary platform lateral to the posterior postcanines and by presenting a unique combination of characters from the premaxilla, maxilla, and dentition (i.e., the precanine diastema; the placement of the paracanine fossa; the number of upper postcanines; the general outline of the upper postcanines crown in occlusal view; the shouldering between adjacent teeth; the expansion of the crown distolateral to the sectorial crest; the extension, limits and deepness of the occlusal basin; the distal ridge-like bulging at the base of the crown; the number and relative placement and development of the cusps). It is a relatively small taxon inferred to have occupied a specialized, small herbivorous/omnivorous role, which in this fauna is otherwise only shared by small individuals of the traversodontid Massetognathus pascuali.
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