PROFILPELAJAR.COM

Requisia; Temporal range: Early Paleocene ; ~62.5–59 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Litopterna
Family:	†Notonychopidae
Genus:	†Requisia; Bonaparte & Morales 1997
Type species
	Requisia vidmari; Bonaparte & Morales, 1997
Species
	R. vidmari Bonaparte & Morales 1997;

Requisia is an extinct genus of litoptern from the Early Paleocene of Argentina. Its fossilized remains were found in the Salamanca Formation in the Chubut Province. It is a monotypic genus, its only known species being Requisia vidmari.^[1]

Description

It had a dental morphology quite similar to Notonychops, but with more basal characters. The cuspid morphology, the type of wear and the crescent-shaped characters of the third upper molar indicates that Requisia vidmari had strong signs of solenodont characters, and is therefore considered as one of the basal representatives of the order Litopterna. Requisia is more basal than Notonychops, but their morphological similarities could justify to include them in the same family, Notonychopidae, potentially alongside Wainka. It is supposed that the adaptive radiation of South American ungulates during the Paleocene was a fast phenomenon, which makes it difficult to find a satisfying phylogenetic model.^[1]

References

^ ^a ^b BONAPARTE, J. F., MORALES, J. (1997). «Un primitivo Notonychopidae (Litopterna) del Paleoceno Inferior de Punta Peligro, Chubut, Argentina». Estudios Geol. 53: 263-274.