[MM] Hallautherium schalchi
The Earliest-Known Stem Mammals
DESCRIBER Clemens, 1980
TIME Triassic Late
Rhaetian
CLASS Mammalia
SUBCLASS Incertae Sedis
ORDER Morganucodonta (Kermack, et al., 1973)
FAMILY Incertae Sedis
FOSSILSITE Hallau Bonebed, Kanton Schaffhausen, Switserland
INFO
Typespecies by monotype. Poorly known genus represented by two lower molariform teeth with a main row of four cucps and one or more anterior and posterior lingual cusps. These molariforms lack a basal lingual cingulum [cingulid] or kuhnecone [gusp g] . Unlike any known morganucodontids, a large, posterior buccal [labial] basin is present on the type ( a small depression on the referred specimen) Teeth are in size range of Morganucodon watsoni and M. peyeri, but are smaller than those of Tricuspes and Hevetiodon. (Clemens, 1980, 1985)