Ophiacodon retroversus Location: American Museum of Natural History, New York, NY Year: 2009 Merckdigitals catalogue number: 22-70887 Comments: AMNH 4155, collected by W. F. Cummins. 1883, Big Wichita River, TX. Permian 280 mya.

Ophiacodon retroversus Location: American Museum of Natural History, New York, NY Year: 2009 Merckdigitals catalogue number: 22-70888 Comments: AMNH 4155, collected by W. F. Cummins. 1883, Big Wichita River, TX. Permian 280 mya.

Ophiacodon retroversus Location: American Museum of Natural History, New York, NY Year: 2015 Merckdigitals catalogue number: 22-87822 Comments: AMNH 4155, collected by W. F. Cummins. 1883, Big Wichita River, TX. Permian 280 mya.

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