Leptalestes cooki ( Clemens, 1966 )
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publication ID |
https://doi.org/ 10.4202/app.00934.2021 |
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persistent identifier |
https://treatment.plazi.org/id/3C0F87E6-3C7A-2712-92D7-63DB91F4FE67 |
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treatment provided by |
Felipe |
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scientific name |
Leptalestes cooki ( Clemens, 1966 ) |
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? Leptalestes cooki ( Clemens, 1966)
Fig. 8D View Fig .
Material.— MWC 8859 View Materials , a left m2 or m3; from the Campanian–Maastrichtian , Williams Fork Formation, J &M site, northwest Colorado, USA .
Description.—MWC 8859, a left m2 or m3, is the only metatherian tooth thus far recovered from the J&M site ( Fig. 8D View Fig ). The protoconid is broken off, but the other cusps are intact. On MWC 8859, the cristid obliqua attaches to the posterior wall of the trigonid near the midline of the protoconid, as is diagnostic for pediomyoids ( Davis 2007). As is characteristic of? Leptalestes cooki (see Davis 2007; Clemens 1966), the metaconid is larger than the paraconid, and the talonid is wider than the trigonid. The entoconid and hypoconulid are twinned, and the posteriorly-projecting hypoconulid is the lowest cusp on the tooth. Anterolabial and posterolabial cingulids are present on MWC 8859, although they do not extend around the labial margins of the proto- and hypoconids, respectively.
Remarks.—MWC 8859 has a length of 2.36 mm, a trigonid width of 1.67 mm, and a talonid width of 1.75 mm. Its size is within the range of m3s of? Leptalestes cooki (= Pediomys cooki ) measured by Clemens (1966: table 22), and is 0.1 mm longer than UCM 57394, a right m2 or m3 of? Leptalestes cooki identified by Diem (1999) from the Williams Fork Formation.? Leptalestes cooki is known from Judithian– Lancian aged localities in the U.S. Western Interior and Alberta, Canada ( Davis 2007).
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