A Third, Remarkably Small, Tribosphenic Mammal from the Mesozoic of Australia

A third species of tribosphenic mammal is now known from Australia. Owing to the fragmentary nature of the two specimens on which this new, diminutive species is based, its affinities within the tribosphenic Mammalia are uncertain. When better known, they could well prove to belong to the Ausktribosphenidae. In estimated body mass, 2 g, the new species is amongst the smallest mammals known.