Walking with dinosaurs placerias series#

This lends support to Olson's (1944) view that the fossa decreased in depth and importance during the course of therapsid evolution.The Late Triassic dicynodont PlaceriasВ is probably one of the most famous dicynodonts, thanks largely to its prominent role in the first episode of the BBC television series Walking with Dinosaurs. only a shallow fossa in the Dinocephalia, while Camp & Welles (1956) state that the fossa is absent in the Triassic Kannemeyeria, Placerias and Stahlekeria. Frontotrans- verse section through basicranial axis and skull roof. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. The vestibule, lying between the opisthotic, prootic. This lends support to Olson's (1944) view that the fossa decreased in depth and importance during the course of therapsid evolution. Pearson (1924) also found indications of the organ in Kannemeyeria. Camp & Wells (1956) found a similar groove leading from a depression in the snout of Placerias and mentioned the possibility of this being evidence for the presence of Jacobson's organ. It seems very probable that the furrow served to transmit the duct of Jacobson's organ. 194 ANNALS OF THE SOUTH AFRICAN MUSEUM posterior part of the furrow is especially deep and clear-cut.

The vestibule, lying between the opisthotic, prootic and basioccipital, opens into the saccul The vestibule, lying between the opisthotic, prootic and basioccipital, opens into the saccul.

In forms with smoothly rounded snouts the nasals diverge posteriorly, whereas in species with transverse frontonasal ridges this is not the case, and the suture between nasals and frontals is straight and tr The nasal forms the dorsal border of the nasal aperture, meets the septo- maxilla, lacrimal and prefrontal laterally, and makes contact with the frontal dorsally. I go ANNALS OF THE SOUTH AFRICAN MUSEUM tinued tusk growth throughout hfe, such as described by Camp & Welles (1956) in Placerias. In forms with smoothly rounded snouts the nasals diverge posteriorly, whereas in species with transverse frontonasal ridges this is not the case, and the suture between nasals and frontals is straight and tr.

Walking with dinosaurs placerias