Simpsonotus is an extinct genus of notoungulate mammals in the family Henricosborniidae from the Middle to Late Paleocene of South America. Fossils of the genus have been found in the Mealla Formation, a fluvial and lacustrine sedimentary unit of the Salta Basin in northwestern Argentina.[1][2] The genus name honors paleontologist George Gaylord Simpson.
| Simpsonotus | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Notoungulata |
| Family: | †Henricosborniidae |
| Genus: | †Simpsonotus Pascual et al. 1978 |
| Type species | |
| †Simpsonotus praecursor Pascual et al. 1978
| |
| Species | |
| |
Description edit
Simpsonotus had a skull similar to Notostylops, but with a shorter and rounder face. The genus contains two species; the type species S. praecursor,[3] and the double-sized S. major,[4] both described by Pascual et al. in 1978.[5]
Age edit
The Mealla Formation was initially described as Riochican in the South American land mammal age classification, and later as Itaboraian, but after the redefinition of the Itaboraí Formation to Early Eocene, the Mealla Formation is Peligran in age.
References edit
- ^ Sánchez & Marquillas, 2009, p.389
- ^ Narváez, 2009, p.172
- ^ S. praecursor at Fossilworks.org
- ^ S. major at Fossilworks.org
- ^ Pascual et al., 1978
Bibliography edit
- Narváez, Paula Liliana. 2009. Palinoestratigrafía, paleoambientes y cambios climáticos durante el Cretácico final y Paleógeno de la Cuenca del Grupo Salta, República Argentina (PhD thesis), 1–229. Universidad Nacional de Salta. Accessed 2020-06-13.
- Sánchez, María Cristina, and Rosa A. Marquillas. 2010. Facies y ambientes del Grupo Salta (Cretácico-Paleógeno) en Tumbaya, Quebrada de Humahuaca, Provincia de Jujuy. Revista de la Asociación Geológica Argentina 67. 383–391. Accessed 2020-06-13.
- Pascual, R.; M.G. Vucetich, and J. Fernández. 1978. Los primeros mamiferos (notoungulata, henricosborniidae) de la Formacion Mealla (Grupo Salta, subgrupo Santa Barbara) : sus implicancias filogeneticas, taxonomicas y cronologicas. Ameghiniana 15. 366-390. .