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Oldest Horse Brains: More Advanced Than Previously Realized

1976; American Association for the Advancement of Science; Volume: 194; Issue: 4265 Linguagem: Inglês

10.1126/science.790567

1095-9203

Leonard Radinsky,

Plant Diversity and Evolution

Previous interpretations of early horse brains were based on an incorrectly identified fossil endocast, now believed to be from a condylarth. Newly prepared endocasts of Hyracotherium , the oldest horse and one of the earliest perissodactyls, reveal a relatively larger brain, with a more expanded neocortex, than existed in the condylarth ancestors of perissodactyls. Fifty million years ago, horse brains had suprasylvian, ectolateral, and lateral sulci, but the frontal lobe was undeveloped.