Estudios Geológicos, Vol 67, No 2 (2011)

Morotochoerus de Uganda (17.5 Ma) y Kenyapotamus de Kenia (13-11 Ma): implicaciones sobre el origen de los hipopotámidos


https://doi.org/10.3989/egeol.40393.205

M. Pickford
Collège de France, and Département Histoire de la Terre, Francia

Resumen


El objetivo de este trabajo es describir e interpretar los dientes suiformes de Moroto, Uganda, y Ngorora, Kenia, que contribuyen al debate sobre las relaciones hipo-anthracothere-whale. Las primeras etapas de la evolución de los hipopotámidos son relativamente poco conocidas a causa de la escasez de su registro fósil en edades superiors a los 7 Ma. Nuevos ejemplares de Morotochoerus en Uganda revelan que no están estrechamente relacionados con Hippopotamidae, las semejanzas superficiales de los dientes de la mandíbula con los de los hipopótamos representan convergencias y no homologías. Algunas muestras de Palaeopotamus ternani aparecen en el Medio Mioceno de Kenia {Maboko, ca 16 Ma; Muruyur, ca 14.5 Ma; Fort Ternan, ca 13.7 Ma}, mientras que desde la base del Mioceno tardío, Kenyapotamus coryndonae aparece en Kenia {Ngerngerwa, ca 10.5-10 Ma; Nakali, ca 10.5 Ma; Samburu Hills, ca 9,5 Ma}, {Ch’orora Etiopía, ca 10.5 Ma} {y Túnez Beglia Formación ca 11-10 Ma}. La obtención de especímenes de Kenyapotamus de la Formación Ngorora, Kenya, con edad ca 11 Ma, es de interés porque incluye dientes bien conservados, incluyendo un m/3 en buenas condiciones. Estos ejemplares apoyan la hipótesis de que los hipotámidos descienden de paleoquéridos y no de antracotéridos.

Palabras clave


Morotochoerinae; Morotochoerus; Kenyapotamus; Hippopotamidae; Palaeochoeridae; Cetartiodactyla; Africa; Miocene; Evolution

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