''Cyrtlatherium'' is a dubious genus of extinct docodontan

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 Middle Jurassic rocks of Oxfordshire, England. As it is only known from a few isolated molar teeth, there is disagreement about whether ''Cyrtlatherium'' is a separate genus, or whether it is a synonym and the molar teeth are the milk teeth of another genus of docodont. ''Cyrtlatherium'' was named from a few single molar teeth found in the

Kirtlington Kirtlington is a village and Civil parishes in England, civil parish in Oxfordshire about west of Bicester. The parish includes the Hamlet (place), hamlet of Northbrook. The United Kingdom Census 2011, 2011 Census recorded the parish's populat ...

mammal beds in England, which were originally thought to belong to a kuehneotheriid,Freeman EF. 1979. A Middle Jurassic mammal bed from Oxfordshire. Palaeontology 22:135-166 but were later reclassified as belonging to a docodont.Sigogneau-Russell D. 200
Docodont nature of Cyrtlatherium, an upper Bathonian mammal from England
Acta Palaeontologica Polonica, 46:429-430 When reclassifying it, Sigogneau-Russell argued that it was the milk tooth of a previously named docodont called '' Simpsonodon''. This is now generally accepted to be the case by most mammal palaeontologists.

References

Docodonts Jurassic synapsids of Europe Fossil taxa described in 1979 Taxa named by Eric F. Freeman Prehistoric cynodont genera {{paleo-therapsid-stub