Semionotiformes

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Semionotiformes
Fossil range: Triassic
Lepidotes maximus from the Solnhofen Limestone, in South Germany
Lepidotes maximus from the Solnhofen Limestone, in South Germany
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Semionotiformes
Arambourg and Bertini, 1958

Semionotiformes ("flag-back form") is an order of primitive, ray-finned, primarily freshwater fish from the Triassic to the Cretaceous. The most well-known genus is Semionotus of Europe and North America.