[MM] Eozostrodon problematicus
The Earliest-Known Stem Mammals
DESCRIBER Parrington, 1941
TIME Triassic Late
?Norian
CLASS Mammalia
SUBCLASS Incertae Sedis
ORDER Morganucodonta (Kermack, et al., 1973)
FAMILY Morganucodontidae (Kühne, 1958)
FALL UNDER Eozostrodon parvus
FOSSILSITE Fissure fillings in Holwell Quarry, Oxford, England, Britain
INFO
Eozostrodon parvus (Parrington, 1941) > Eozostrodon problematicus (Parrington, 1941)
Eozostrodon differs from Morganucodon watsoni in having a better/developed labial cingulum on the upper premolar, a more gracile and posteriorly reclined cusp C, and more tapering distal end of theposterior root. (Parrington, 1971; Clemens, 1979). Eozostrodon watsoni and Eozostrodon heikuopengensis are now assigned to Morganucodon.