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Two Asian cricetodontine-like muroid rodents from the Neogene of western North America

Published online by Cambridge University Press:  13 April 2023

Robert A. Martin Open the ORCID record for Robert A. Martin [Opens in a new window] ,
Thomas S. Kelly Open the ORCID record for Thomas S. Kelly [Opens in a new window]  and
Patricia Holroyd Open the ORCID record for Patricia Holroyd [Opens in a new window]
Robert A. Martin*
Affiliation:
Department of Biological Sciences, Murray State University, Murray, Kentucky 42071, USA.
Thomas S. Kelly
Affiliation:
Research Associate, Department of Vertebrate Paleontology, Natural History Museum of Los Angeles County, Los Angeles, California 90007, USA.
Patricia Holroyd
Affiliation:
University of California Museum of Paleontology, Berkeley, California 94720, USA.
*
*Corresponding author.
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Abstract

We appraise the morphology and potential origin of two Neogene cricetodontine-like muroids, Pliotomodon primitivus from Late Miocene sediments in northern California and an undescribed muroid from the late Oligocene or Early Miocene of central Oregon. Superficial resemblance of the dentition of Pliotomodon with members of the North American galushamyinan neotominins is considered a result of parallel evolution, as shown by the large size and unreduced M3/m3 of the former. Dental features of Pliotomodon are similar to those of Eurasian genera such as Byzantinia, Hispanomys, and Ruscinomys, but the unusual morphology of M3/m3, with continuous enamel connections across their lingual surfaces closing the hypoflexus and posteroflexid, respectively, plus retention of only three roots on M1, suggests Pliotomodon arose from an ancestor distinct from the one that gave rise to the large late Neogene hypsodont cricetodontines of the Old World. In the absence of known ancestral taxa in North America, we postulate Pliotomodon dispersed to North America across Beringia during the Hemphillian (ca. 8.6 Ma, Hh-1). Another archaic cricetodontine-like rodent, from the Warm Springs region of the John Day Formation in Oregon, is named as a new species of Deperetomys, D. dingusi new species. Deperetomys dingusi n. sp. likely descended from a species of Deperetomys intermediate between archaic species such as D. calefactus and D. magnus and more dentally derived species such as D. intermedius and D. hagni, dispersing to North America during the late Oligocene or Early Miocene (Arikareean; ca. 23 Ma, Ar3 or Ar4).

UUID: http://zoobank.org/b691db3a-79de-4d3e-8af0-3bda4957b119

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Journal of Paleontology , Volume 97 , Issue 3 , May 2023 , pp. 735 - 753
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Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Paleontological Society

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