Abstract
Do specimens attributed to Lystrosaurus murrayi and L. declivis (Triassic Therapsida) represent one species?
Highlights
Lystrosaurus murrayi and L. declivis are two dicynodont (Therapsida, or mammal-like reptile) species commonly represented in Triassic deposits which are referred to as the ‘Lystrosaurus Assemblage Zone’ of the South African Karoo, postdating the Permo-Triassic boundary at 252 million years ago
Botha-Brink et al.[6] retain the view that two Triassic taxa of Lystrosaurus can be distinguished. They examined as many as 97 crania attributed by them to L. murrayi, and 99 crania attributed to L. declivis.[6]
In order to test these two hypotheses, attention was given to the maximum basal skull length (BSL) dimensions in a total of 196 specimens of Lystrosaurus in Triassic deposits.[6]
Summary
Lystrosaurus murrayi and L. declivis are two dicynodont (Therapsida, or mammal-like reptile) species commonly represented in Triassic deposits which are referred to as the ‘Lystrosaurus Assemblage Zone’ of the South African Karoo, postdating the Permo-Triassic boundary at 252 million years ago. Do specimens attributed to Lystrosaurus murrayi and L. declivis (Triassic Therapsida) represent one species?
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