2006/01/01 by Mariano Bond, Marcelo Reguero, Sergio F. Vizcaı́no +1 · 7 citations
Earth and Planetary Sciences · #Evolution and Paleontology Studies #Paleontology and Evolutionary Biology #Paleontology and Stratigraphy of Fossils
paper · doi:10.1144/gsl.sp.2006.258.01.12
openalex publication_date 2006/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Abstract Notolophus arquinotiensis , a new genus and species of the family Sparnotheriodontidae (Mammalia, Litopterna), is represented by several isolated teeth from the shallow-marine sediments of the La Meseta Formation (late Early-Late Eocene) of Seymour Island, Antarctic Peninsula, which have also yielded the youngest known sudamericids and marsupials. The new taxon belongs to the extinct order of ‘South American native ungulate’ Litopterna characterized by the convergence of the later forms with the equids and camelids. Notolophus arquinotiensis shows closest relationships with Victorlemoinea from the Itaboraian (middle Palaeocene) of Brazil and Riochican-Vacan (late Palaeocene-early Eocene) of Patagonia, Argentina. Although still poorly documented, this new taxon shows that the early Palaeogene Antarctic faunas might provide key data concerning the problems of the origin, diversity and basal phylogeny of some of the ‘South American ungulates’ (Litopterna). This new taxon shows the importance of Antarctica in the early evolution of the ungulates and illustrates our poor state of knowledge.