GEOMYIDAE INDET.
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publication ID |
https://doi.org/10.5070/P9351037578 |
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DOI |
https://doi.org/10.5281/zenodo.13749657 |
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persistent identifier |
https://treatment.plazi.org/id/B21F87F3-8C78-FFFC-FBA3-FB9DFAEFF974 |
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treatment provided by |
Felipe (2024-09-11 01:57:22, last updated 2024-11-05 19:27:50) |
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scientific name |
GEOMYIDAE INDET. |
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Referred specimen —Dentary fragment with p4 through m2, JODA 3770.
Occurrence —UCMP -3043.
Description —The m1 and m2 of this specimen are broken down the middle but remain largely intact. All three teeth are heavily worn. The metalophid on the p4 is wide, flattened anteriorly and has broad connection with the hypolophid. The hypolophid has three cusps. This specimen is placed in Geomyidae based on the premolar’s larger size than the molars.
Remarks —This specimen is similar to the entoptychine, Gregorymys Wood, 1936 , by having p4 longer than the m1 and a hypolophid with three cusps ( Flynn et al. 2008). It is unlike the geomyine, Parapliosaccomys Shotwell, 1967 , because the metalophid is wide, and it is too small to be Geomys Rafinesque, 1817 . JODA 3770 could be Gregorymys , but there is no anterior cingulum on the p4; however, that character is known to be variable in the genus ( Flynn et al. 2008).
Flynn, L. J., E. H. Lindsay and R. A. Martin. 2008. Geomorpha. Pp. 428 - 455 in C. M. Janis, G. F. Gunnell, M. D. Uhen (eds.). Evolution of Tertiary Mammals of North America Volume 2: Small Mammals, Xenarthrans, and Marine Mammals. Cambridge University Press.
Rafinesque, C. S. 1817. Description of seven new genera of North American quadrupeds. American Monthly Magazine 2: 44 - 46.
Shotwell, J. A. 1967. Late Tertiary Geomyoid rodents of Oregon. Bulletin of the Museum of Natural History, University of Oregon 9: 1 - 51.
Wood, A. E. 1936. Fossil heteromyid rodents in the collections of the University of California. American Journal of Sciences 32: 112 - 119.
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