Description

Late Triassic (Norian)
Fissure Fill
Pant Quarry, near Bridgend, South Glamorgan, Wales.
Excellent 1mm tooth of one of the very earliest mammals ever found.
Mammal,

Like Morganucodon, Kuehneotherium is a genus considered by most researchers to be one of the earliest-known mammals.  However, others prefer to call them “mammaliaform,” which means that they are closely-related to early mammals but not true mammals.  Some might say that’s splitting hairs.

Both genera were about the size of modern shrews and likely had a very similar lifestyle.