''Cyrtlatherium'' is a dubious genus of extinct

docodonta Docodonta is an Order (biology), order of extinct Mesozoic Mammaliaformes, mammaliaforms (advanced cynodonts closely related to true Crown group, crown-group mammals). They were among the most common mammaliaforms of their time, persisting from t ...

mammaliaform Mammaliaformes ("mammalian forms") is a clade of synapsid tetrapods that includes the crown group mammals and their closest extinct relatives; the group radiated from earlier probainognathian cynodonts during the Late Triassic. It is defined a ...

from the Middle Jurassic rocks of

Oxfordshire Oxfordshire ( ; abbreviated ''Oxon'') is a ceremonial county in South East England. The county is bordered by Northamptonshire and Warwickshire to the north, Buckinghamshire to the east, Berkshire to the south, and Wiltshire and Glouceste ...

, 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

deciduous teeth Deciduous teeth or primary teeth, also informally known as baby teeth, milk teeth, or temporary teeth,Fehrenbach, MJ and Popowics, T. (2026). ''Illustrated Dental Embryology, Histology, and Anatomy'', 6th edition, Elsevier, page 287–296. are ...

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 popula ...

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

Docodonta Middle Jurassic synapsids of Europe Fossil taxa described in 1979 Taxa named by Eric F. Freeman {{paleo-cynodont-stub