Temporal range: Early Triassic, 248–247.2 Ma
Gamosaurus is an extinct genus of archosauriform, possibly proterosuchian, known from the Early Triassic (latest Olenekian stage) Yarenskian Gorizont of the European section of Russia. It contains a single species, Gamosaurus lozovskii. Gamosaurus was named by Vitalii Georgievich Ochev in 1979. Gamosaurus is known solely from fragmentary material collected from the a fossil assemblage called the Parotosuchus fauna of the Upper Yarenskian Gorizont, in the Gam locality in Aikino district of the Komi Republic. Gamosaurus occurs with the erythrosuchian Garjainia and with material possibly referable to the paracrocodylomorph Vytshegdosuchus.
- Ochev, Vitalii G. (1979). "New early Triassic Archosaurian Reptiles from the east of the European Regions of the USSR". Palaeontological Journal 13 (1): 97–102.
- Sterling J. Nesbitt (2009). "The early evolution of archosaurs: Relationships and the origin of major clades". Columbia University (open access dissertation): 1–632.
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