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Metatherian molar
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By ThePhysicist
Taxonomy
Marsupial
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Didelphimorphia
Family: Alphadontidae
Genus: indet.
Species: indet.
Author Citation Linneas, 1758
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Cretaceous
Sub Period: None
Epoch: Late
Stratigraphy
Aguja Formation
Provenance
Acquired by: Purchase/Trade
Dimensions
Height: 2 mm
Location
Brewster County
Texas
United States
- aguja
- aguja formation
- c(a)m1
- cretaceous
- cretaceous mammal
- marsuptial
- mesozoic mammal
- metatheria
- metatherian
- microfossil
Comments
Rowe, Timothy, et al. “The Campanian Terlingua Local Fauna, with a Summary of Other Vertebrates from the Aguja Formation, Trans-Pecos Texas.” Journal of Vertebrate Paleontology, vol. 12, no. 4, [Society of Vertebrate Paleontology, Taylor & Francis, Ltd.], 1992, pp. 472–93, http://www.jstor.org/stable/4523473.
DeMar also has a nice description of the differentiation between eutherian/metatherian upper molars:
"The upper molars of metatherians and eutherians are triangular shaped with three major cusps or bumps on the occlusal surface of the crown. The main differences between metatherian and eutherian upper molars are that metatherians have more small cusps on the outer side (labial) of the occlusal surface of the tooth and have a front to back (mesiodistal) longer tooth."
https://naturalhistory.si.edu/sites/default/files/media/file/fossil-id-guide062812-accessible.pdf
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