[1] Long, slender snouts that are characteristic of the trematosaurids, with some members having rostra resembling those of modern-day gavials.

Trematosaurids first appeared during the Induan[3] age (Wordie Creek Formation, Greenland) of the Early Triassic epoch.

By the Middle Triassic they had become widespread throughout Laurasia and Gondwana with fossils being found in Europe, Asia, Madagascar, and Australia.

If this analysis is accurate, it renders Trematosauridae one of the longest lived lineages of the Temnospondyli, having lasted as recently as the late Jurassic.

[6] Below is a cladogram from Steyer (2002) showing the phylogenetic relationships of trematosaurids:[1] Tertrema Lyrocephaliscus Platystega Luzocephalus Trematosaurus Trematosuchus Aphaneramma Erythrobatrachus Cosgriffius Stoschiosaurus Wantzosaurus A cladogram after Novikov (2018) with only Early Triassic Eastern Europe taxa included:[7] Prothoosuchus Thoosuchus Trematotegmen Angusaurus Inflectosaurus Trematosaurus