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Callistomordax is an extinct genus of temnospondyl amphibian from the Middle Triassic of Germany. The type and only species, Callistomordax, was named in 2008. It is known from several well-preserved skeletons found in the Erfurt Formation, part of the Lower Keuper, which dates back to the late Ladinian stage.
Phylogeny
Below is a cladogram from Schoch (2008):
References
Callistomordax Wikipedia(Text) CC BY-SA