Bibliography Record
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Matsui, Kumiko; Pyenson, Nicholas D.
(detail)
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2023 |
New evidence for the antiquity of Desmostylus from the Skooner Gulch Formation of California.
_Royal Society Open Science_ 10: 221648. 1 tab. 4 figs. https://doi.org/10.1098/rsos.221648 + electronic suppl. material at https://doi.org//10.6084/m9.figshare.c.6673576.
–ABSTRACT: Desmostylus is an extinct marine mammal genus that belongs to Desmostylia, a clade of extinct herbivorous mammals. While desmostylian remains are widely reported from Paleogene and Neogene marine strata of the North Pacific Rim, occurrences of the genus Desmostylus are almost entirely limited to middle Miocene strata, with only a few early Miocene records from Japan. Here we report a Desmostylus tooth from the earliest Miocene (Aquitanian) Skooner Gulch Formation in northern California, USA. This specimen exhibits cuspules around the crown, a primitive trait of the subfamily Desmostylidae, as seen in more basal branching desmostylid taxa such as Cornwallius and Ounalashkastylus, but with a high tooth crown and thickened enamel. The specimen is also diagnostically different from all other desmostylid genera, such as Cornwallius, and Ounalashklastylus. The Aquitanian age of the Skooner Gulch Formation implies that the distinctive tooth morphology of Desmostylus has persisted, largelyunchanged, for more than 15 million years and that desmostylids possibly originated in western North America.
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Related Index Records (5)
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California
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2023 |
Matsui & Pyenson (Desmostylus, Skooner Gulch Fm.) |
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Cornwallius Hay, 1923
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2023 |
Matsui & Pyenson (comp. w/ Desmostylus.) |
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Desmostylus Marsh, 1888
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D |
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2023 |
Matsui & Pyenson (Aquitanian age of Skooner Gulch specimen, California.) |
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Miocene
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2023 |
Matsui & Pyenson (Desmostylus, Aquitanian Skooner Gulch Fm., California.) |
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Ounalashkastylus Chiba et al., 2015
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2023 |
Matsui & Pyenson (comp. w/ Desmostylus.) |
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