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Temporal range: Late Triassic to Earliest Jurassic
Semionotus bergeri.jpg
Fossils of S. bergeri
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Semionotiformes
Family: Semionotidae
Genus: Semionotus

Semionotus ("Flag-Back") 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.

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

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