Weltonia ancistrodon ( Arambourg, 1952 )
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publication ID |
https://doi.org/ 10.4202/app.01117.2023 |
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persistent identifier |
https://treatment.plazi.org/id/03E18741-1303-EF07-DF68-FE87FBD4F986 |
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treatment provided by |
Felipe |
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scientific name |
Weltonia ancistrodon ( Arambourg, 1952 ) |
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Weltonia ancistrodon ( Arambourg, 1952)
Fig. 2G View Fig .
Material.—One lower lateral tooth (RU-EFP-04142) from either the upper Danian portion of the Hornerstown Formation or the Thanetian Vincentown Formation, Edelman Fossil Park, Mantua Township, New Jersey, USA.
Description.—The principal cusp is elongate, slender, distally directed, and sigmoidal. It is over four times taller than the first distal cusplet. The lingual face of the principal cusp is strongly convex whereas its labial face is slightly convex. A single, subtle protuberance (“serration”) occurs near the base of the mesial edge of the principal cusp. Four distal cusplets are present, which are distally directed, slightly labially inclined, and decrease regularly in size. The root is trapezoidal, lessening in height distally, with a distinct mesial depression. Its labial face is flat whereas a distinct mesiodistal ridge runs along the upper portion of the lingual face, creating a slightly concave region below it.
Remarks.—Possession of an extremely tall principal cusp (≥50% taller than the first distal cusplet) that is slender and sigmoidally curved identifies this specimen as Weltonia ( Ward 1979; Cappetta 1987). The extremely elongate nature of the principal cusp (over four times as tall as the first distal cusplet) is consistent with the condition in W. ancistrodon , whereas in the only other known species, W. burnhamensis Ward, 1979 , the principal cusp is only about 50% taller than the first distal cusplet ( Ward 1979).
Case (1996) reported eight specimens of Weltonia ancistrodon recovered from an exposure of the lower Hornerstown Formation in “Deep Run”, a tributary of Crosswicks Creek in Monmouth County, New Jersey. This was the first report of W. ancistrodon from North America. The new specimen described here also likely derives from the Danian portion of the upper Hornerstown Formation and represents a new addition to the fauna of the EFPQ.
Stratigraphic and geographic range.—Lower Paleocene (Danian) to lower Eocene (Ypresian) of New Jersey in USA, England, and Morocco.
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