Simpsonodon

Not to be confused with Simpsonotus.

Simpsonodon is an extinct genus of docodontan mammaliaform known from the Middle Jurassic of England, Kyrgyzstan and Russia. The type species S. oxfordensis was described from the Kirtlington Mammal Bed and Watton Cliff in the Forest Marble Formation of England. It was named after George Gaylord Simpson, a pioneering mammalologist and contributor to the Modern Evolutionary Synthesis.^[1] A second species S. sibiricus is known from the Itat Formation of Russia,^[2] and indeterminate species of the genus are also known from the Balabansai Formation in Kyrgyzstan^[3]

Simpsonodon Temporal range: Bathonian-Callovian ~165–162 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Clade:	Mammaliaformes
Order:	†Docodonta
Genus:	†Simpsonodon Kermack et al, 1987
Type species
†Simpsonodon oxfordensis Kermack et al, 1987
Other species
†S. sibiricus (Averianov et al, 2010)