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Morphology of the skull in Meniscomys from the John Day Formation of central Oregon


PaleoBios 26(1): 1-9
Morphology of the skull in Meniscomys from the John Day Formation of central Oregon
Aploclontoid rodents are very diverse through the Oligocene and Miocene in North America. They are represented in the fossil record by a number of morphologically distinct lineages, many of which arc represented in the John DaN Formation of central Oregon. Although the diversity of dental morphologies in this lineage is Well understood, skull morphology is well-described for only the mylagaulid and aplodontine lineages of aplodontoids. Less well-preserved skulls have also been described from the basal paraphyletic group of prosciurines and for the allomyines lineage. This paper describes the morphology of the skull in Meniscomys, a taxon that lies at the transition between Paleogerie and Neogene groups of aploclontoids. These groups are quite distinct in dental and cranial morphology and inferred ecology. Examination of the skull of Meniscomys shows that it retains a number of plesiomorphic characters, but shows some evidence of the shortening, broadening, and flattening that characterizes Neogene aplodontoids.

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Accession: 012994748



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