Middle Triassic genus first appearances

Cynognathus is an extinct genus of large-bodied cynodontian therapsids that lived in the Middle Triassic. It is known from a single species, Cynognathus crateronotus. Cynognathus was a predator closely related to mammals and had a southern hemispheric distribution. Fossils have so far been recovered from South Africa, Argentina, Antarctica, and Namibia.

Pleurotomaria is an extinct genus of sea snails, marine gastropod molluscs in the family Pleurotomariidae.

Aeger is a genus of fossil prawns. They first occur in the Early Triassic (Paris biota), and died out at the end of the Late Cretaceous. A total of 21 species are known, which makes this the most diverse genus in the family Aegeridae.

genus of molluscs (fossil)