INFORMACIÓN ADICIONAL SOBRE LOS ARCOSAURIFORMES DE LA FORMACIÓN PANCHET DEL TRIÁSICO MÁS BAJO DE LA INDIA Y LAS AFINIDADES DE “TERATOSAURUS(?) BENGALENSIS”
DOI:
https://doi.org/10.5710/PEAPA.26.02.2024.496Palabras clave:
Archosauriformes, Proterosuchidae, Induano, Taxononom´´iaResumen
La Formación Panchet del noreste de la India preserva una asociación de vertebrados induanos (Triásico Temprano) con una sola especie de arcosauromorfo válida, el proterosúquido Samsarasuchus pamelae. Dos otras especies de arcosauromorfos han sido nombradas para esta unidad: “Ankistrodon indicus” y “Teratosaurus(?) bengalensis”. “Ankistrodon indicus”, basado en un fragmento de maxilar con dos dientes parciales, es indistinguible de otras especies de proterosúquidos y es considerado un nomen dubium. “Teratosaurus(?) bengalensis” está representado por un diente aislado casi completo que fue diferenciado de “Ankistrodon indicus” por la presencia de dentículos mesiales. “Teratosaurus(?) bengalensis” es también indistinguible de otras especies válidas de proterosúquidos y considerado probablemente como un nomen dubium. Sin embargo, permanece sin resolverse si “Teratosaurus(?) bengalensis” representa una segunda especie de arcosauromorfo de Panchet diferente de Samsarasuchus pamelae y “Ankistrodon indicus” porque la presencia de dentículos mesiales no puede ser determinada en estas especies debido a su incompletitud. Aquí describimos dos nuevos especímenes de Proterosuchidae de Panchet colectados en la misma localidad que los holotipos de las tres especies mencionadas anteriormente. Estos nuevos especímenes son fragmentos de maxilar y uno de ellos tiene dientes casi completos con dentículos mesiales en la porción apical de las coronas, como en “Teratosaurus(?) bengalensis”. El resto de su morfología es congruente con aquella de Samsarasuchus pamelae y “Ankistrodon indicus”. Los especímenes comunicados aquí expanden nuestro conocimiento anatómico de la asociación de arcosauriformes de Panchet e indican que no hay actualmente evidencia de la presencia de más de una especie válida de arcosauromorfo en la Formación Panchet.
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