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''Peraiocynodon'' is an extinct
mammaliaform Mammaliaformes ("mammalian forms") is a clade that contains the crown group mammals and their closest extinct relatives; the group radiated from earlier probainognathian cynodonts. It is defined as the clade originating from the most recent comm ...
from the order
Docodonta Docodonta is an order of extinct mammaliaforms that lived during the Mesozoic, from the Middle Jurassic to Early Cretaceous. They are distinguished from other early mammaliaforms by their relatively complex molar teeth, from which the order ge ...
, found in the Middle Jurassic rocks of the United Kingdom. It is only known from isolated molar teeth found in the mammal bed at
Kirtlington Kirtlington is a village and civil parish in Oxfordshire about west of Bicester. The parish includes the hamlet of Northbrook. The 2011 Census recorded the parish's population as 988. The parish measures nearly north–south and about east ...
cement quarry in Oxfordshire, England (
Forest Marble Formation The Forest Marble is a geological formation in England. Part of the Great Oolite Group, it dates to the late Bathonian stage of the Middle Jurassic.Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, Europe)." In: Weisha ...
). ''Peraiocynodon'' was originally erected in 1929 with a single species named,Simpson GG. 1928. A Catalogue of the Mesozoic Mammalia in the Geological Department of the British Museum. British Museum. but it was later considered to be a synonym of ''
Docodon ''Docodon'' (meaning 'beam tooth') was a mammaliaform from the Late Jurassic of western North America. It was the first docodontan cynodont to be named. Description ''Docodon'' was the first docodontan cynodont found and named, and later gave ...
''.Butler PM. 1939
The teeth of the Jurassic mammals
In Proceedings of the Zoological Society of London, 109:329-356). Oxford, UK: Blackwell Publishing Ltd.
However, in 2003, the genus was resurrected and a new species, ''P. major'', was described based on new teeth found at Kirtington Cement Quarry in Oxfordshire.Sigogneau-Russell D. 2003
Docodonts from the British Mesozoic
Acta Palaeontologica Polonica, 48(3)
It remains uncertain whether one or both of these species of ''Peraiocynodon'' may be the milk teeth of another genus of docodontan, or whether they truly are separate species.


References

Docodonts Jurassic synapsids of Europe Fossil taxa described in 1929 Taxa named by George Gaylord Simpson Prehistoric cynodont genera {{paleo-therapsid-stub