Abstract
AbstractThe endocranial cast of Tetonius homunculus, a 55 million year old tarsioid primate, is primitive in having relatively large olfactory bulbs and small frontal lobes, but remarkably advanced for an Early Eocene mammal in its voluminous occipital and temporal lobes. Expansion of occipital and temporal cortical regions of the brain suggests improvement in visual and auditory function, which may have been an important factor in the Early Eocene radiation of the primates.
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