Saniwa ensidens Leidy 1870 (squamates)

Reptilia - Squamata

Alternative combination: Saniva ensidens

Synonyms: Saniwa agilis Marsh 1872, Saniwa brooksi Brattstrom 1955, Saniwa crassa Marsh 1872, Saniwa grandis Marsh 1872, Saniwa paucidens Marsh 1872, Thinosaurus agilis Marsh 1872, Thinosaurus crassus Marsh 1872, Thinosaurus grandis Marsh 1872, Thinosaurus leptodus Marsh 1872, Thinosaurus paucidens Marsh 1872

Full reference: J. Leidy. 1870. [Descriptions of Emys jaenesi, E. haydeni, Baena arenosa, and Saniwa ensidens]. Proceedings of the American Philosophical Society 1870:123-124

Belongs to Saniwa according to O. Rieppel and L. Grande 2007

See also Brattstrom 1955, Cope 1873, Gilmore 1928, Hay 1902, Leidy 1870, Marsh 1872 and Smith et al. 2018

Sister taxa: Saniwa edura, Saniwa feisti, Saniwa major, Saniwa orsmaelensis

Type specimens:

  • Saniwa ensidens: USNM 2185, a set of postcrania (disarticulated partial skeleton including partial skull and mandible fragment). Its type locality is East of Granger, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
  • Saniwa brooksi: LACM CIT. No. 5117, a set of vertebrae (four vertebrae). Its type locality is San Diego Mission (CIT 249), which is in an Uintan terrestrial conglomerate in the Friars Formation of California.
  • Thinosaurus agilis: YPM 609, a partial skeleton (dentary with one tooth, four vertebrae, distal femur, distal phalanx). Its type locality is Henry's Fork, which is in an Eocene terrestrial horizon in the Bridger Formation of Wyoming.
  • Thinosaurus crassus: YPM 610, a set of postcrania (a number of dorsal vertebrae and a few other less characteristic remains). Its type locality is Henry's Fork, which is in an Eocene terrestrial horizon in the Bridger Formation of Wyoming.
  • Thinosaurus grandis: YPM 611 (part), a set of postcrania (trunk vertebra lacking the condylar end). Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
  • Thinosaurus leptodus: YPM 612 (anterior portion of right dentary, plus posterior skeleton). Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
  • Thinosaurus paucidens: YPM (unknown, lost), a partial skeleton (greater part of a skeleton). Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.

Ecology: carnivore

Distribution:

• Eocene of United States (11: New Mexico, North Dakota, Wyoming collections)

Total: 11 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.


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