Thryptacodon orthogonius (extinct)
Variant names:
 Chriacus orthogonius
 Thryptacodon demari

Latitudinal range: 44.9° to 46.2°
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Found in two samples

United States: Douglass Quarry (Middle Palaeocene), Rock Bench Quarry (Early Palaeocene)

See also Thryptacodon, Thryptacodon antiquus, Thryptacodon australis, Thryptacodon pseudarctos, Thryptacodon sp.