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Description

during the transition from the Cretaceous to the Paleocene

placing it among the largest non-sauropod herbivorous dinosaurs in history

primitive synapsids that dominated terrestrial ecosystems before the rise of reptiles proper

it was one of the largest terrestrial mammals of its time

known primarily from a relatively complete skull (CMNH 7541) found in the Hell Creek Formation of Montana

Protosiren fraasi discokeryx during the transition from theProtosiren fraasi fue uno de los primeros mamferos marinos del grupo de los sirenios, antepasados de los actuales manates y dugongos. Vivi durante el Eoceno medio, hace aproximadamente 40 millones de aos, y sus fsiles han sido hallados en regiones del norte de frica y del Medio Oriente, incluyendo Egipto y Pakistn. Este gnero representa una etapa intermedia clave en la evolucin de los sirenios, cuando estos animales estaban en transicin desde una vida

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