Trematotegmen is an extinct genus of trematosaurian temnospondyl within the family Trematosauridae.

[1] Trematotegmen in a cladogram after Novikov (2018) with only Early Triassic Eastern Europe taxa included:[2] Luzocephalus Samarabatrachus Poryolosuchus Parotosuchus Selenocara Wetlugasaurus Vladlenosaurus Qantas Prothoosuchus Thoosuchus Trematotegmen Angusaurus Inflectosaurus Trematosaurus Syrtosuchus Benthosuchus Vyborosaurus Yarengia

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