Atrato slider

The Atrato slider (Trachemys medemi) is a species of turtle in the family Emydidae endemic to northwestern Colombia.[1] It was described in 2017.[1][2]

Atrato slider
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Superfamily: Testudinoidea
Family: Emydidae
Genus: Trachemys
Species:
T. medemi
Binomial name
Trachemys medemi
Vargas-Ramírez, del Valle, Ceballos & Fritz, 2017[1]

Geographic range

The Atrato slider's geographical range is in the lower Atrato river basin of Antioquia and Chocó departments of northwestern Colombia, near the Panamanian border.

Evolutionary history

There were two major migrations of sliders into South America during the Great American Interchange of the Cenozoic. During the first migration, which occurred about 7.1-8.6 million years ago, the last recent common ancestor of T. medemi and T. dorbigni spread from Central America into South America, with T. dorbigni expanding into the eastern parts of the continent while T. medemi remained in present-day Colombia. T. medemi diverged from T. dorbigni about 2.8-4.1 million years ago, with T. dorbigni diversifying about 1.9-2.3 million years ago. In the meantime, during the second migration of Trachemys sliders 2.2-2.5 million years ago, T. venusta arrived in South America.[1]

References
  1. Vargas-Ramírez, Mario; Del Valle, Carlos; Ceballos, Claudia P.; Fritz, Uwe (2017). "Trachemys medemi n. sp. from northwestern Colombia turns the biogeography of South American slider turtles upside down". Journal of Zoological Systematics and Evolutionary Research. 55 (4): 326–339. doi:10.1111/jzs.12179.
  2. Uetz, P.; Freed, P.; Hošek, J. (eds.). "Trachemys medemi". The Reptile Database. Retrieved 22 November 2018.
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