Full reference: R. Owen. 1859. Palaeontology. The Encyclopaedia Brittanica, or Dictionary of Arts, Sciences, and General Literature (8th Edition) 17:91-176
Parent taxon: Apsidospondyli according to A. S. Romer 1947
See also Carroll 1967, Carroll 1988, Cope 1875, Daly 1973, Haubold 1971, Haubold 1974, Hay 1902, Kuhn 1946, Lydekker 1889, Murry 1989, Owen 1859, Owen 1860, Owen 1861 and Säve-Söderbergh 1934
Sister taxa: none
Subtaxa: Chalcosaurus Corvipes Eupleurodus Triaenopus
Ecology:
Distribution:
• Cretaceous of Kyrgyzstan (1 collection)
• Jurassic of Kyrgyzstan (1), United States (5: Connecticut, Massachusetts)
• Triassic of Poland (1), Switzerland (1), United States (1: Texas)
• Permian of the Russian Federation (5), United States (1: Kansas)
Total: 16 collections including 18 occurrences