Semionotus

Semionotus (from Greek: σημιον semion, 'mark' and Greek: νῶτος nôtos, 'back')[1] is an extinct genus of ray-finned fish found throughout Northern Pangaea (North America and Europe) during the late Triassic, becoming extinct in the Early Jurassic.

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Fossil slab of S. kapffi mass mortality
Reconstruction of a generalized individual