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The family Lonchorhynchidae is considered to comprise at least two subfamilies, Cosgriffiinae (
Cosgriffius
Welles and a form from the Zaplavnian Horizon (Upper Induan Substage) of the Buzuluk Depression (Shishkin, 2002)) and Lonchorhynchinae (
Aphaneramma
Woodward,
Wantzosaurus
Lehman, and a form described by Damiani and Welman (2001) from the
Lystrosaurus
Zone of South Africa). In addition, the Lonchorhynchidae are considered to include the genera
Erythrobatrachus
Cosgriff et Garbutt and
Stoschiosaurus
Säve-Söderbergh, the subfamily of which is presently uncertain. A new lonchorhynchid specimen from the Zaplavnian Horizon of the Buzuluk Depression is described, the postorbital structure of which suggests that it may belong to
Stoschiosaurus
.