Branisella

Branisella is an extinct genus of New World monkey from the Salla Formation of what is now Bolivia during the Late Oligocene, approximately 26 million years ago (Deseadan), comprising only the species Branisella boliviana.[1][2] Together with the Peruvian genus Canaanimico, it is the oldest fossil New World monkey discovered.

Branisella
Temporal range: Late Oligocene (Deseadan)
~26 Ma
↓
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Haplorhini
Infraorder: Simiiformes
Family: Cebidae
Subfamily: †Branisellinae
Genus: †Branisella
Type species
†Branisella boliviana

Description

It was found in Bolivia by the paleontologist Leonardo Branisa, and it was named after him by Hoffstetter, the scientist who first described and classified it in 1969.[3] Morphologically, it is similar to Proteopithecus, an Oligocene primate from Africa, in its reduced upper second premolar and unreduced lower second premolar. This suggests the primitive platyrrhine ancestors of Branisella came to South America from Africa. Other features, however, suggest that it may have been related to the omomyids, an extinct group of tarsier-like primates found in North America, among other places.[4]

Within platyrrhines, this taxon has been interpreted as either a stem platyrrhine not related to any of the living forms, or as a primitive callitrichine. As Branisella is currently the only South American primate taxon known until the Miocene, more fossils are needed before its phylogenetic position can be clearly established.

The cheek teeth of Branisella are very high-crowned, suggesting that it might have been somewhat terrestrial,[5] although this hypothesis cannot be confirmed from bones of the postcranial skeleton (there are none). The known dental specimens show extremely heavy and rapid wear and the first molar tooth is far more worn than the last, suggesting that it included abrasive foods in its diet with very poorly developed cutting edges indicating a diet of fruit.[5] One specimen retains a small part of the orbit and indicates that Branisella had small eyes and was diurnal.

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References
  1. Branisella at Fossilworks.org
  2. Takai, M; et al. (February 2000). "New fossil materials of the earliest new world monkey, Branisella bolivians, and the problem of platyrrhine origins". American Journal of Physical Anthropology. 111 (2): 263–81. doi:10.1002/(SICI)1096-8644(200002)111:2<263::AID-AJPA10>3.0.CO;2-6. PMID 10640951.
  3. Hoffstetter MR (1969). "Un primate de l'Pliocène inférieur sudamericain: Branisella boliviana gen. et sp. nov". C. R. Acad. Sci. Paris (in French). 269: 434–437.
  4. Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 288. ISBN 978-1-84028-152-1.
  5. Kay R.F., Williams B.A., Anaya F., 2001. The adaptations of Branisella boliviana, the earliest South American monkey. In: Plavcan J.M., van Schaik C., Kay R.F., Jungers W.L. (Eds) Reconstructing Behavior in the Primate Fossil Record. Kluwer Academic/Plenum Publishers, New York, pp. 339–370
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