The postcranial skeleton of the Lower Jurassic Tritylodon longaevus from Southern Africa

ABDALA, NESTOR F.; GAETANO, LEANDRO C.; GOVENDER, ROMALA

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2017 vol. 54 p. 1 - 35

0002-7014

Tritylodon longaevus Owen is one of the most common members of the Lower Jurassic faunas of the Karoo Basin. The cranial anddental anatomy of this taxon is well known, but its postcranium has not been previously addressed in detail. Our analysis shows that T. longaevusshares many postcranial features with other tritylodontids that distinguish them from other non-mammaliaform cynodonts. The correlationbetween taxon size and postcranial anatomical traits is briefly explored among tritylodontids, showing that few morphological differencesamong species correlate with size. Analysis of the purported oldest remains of Tritylodon, from the Norian Los Colorados Formation of Argentina,suggests that they cannot be unambiguously assigned to this taxon, circumscribing the record of Tritylodon to African localities.