Semionotiformes

Semionotiformes; Temporal range: Late Permian-Late Cretaceous
	Scheenstia maximus from the Solnhofen Limestone, in South Germany
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Clade:	Ginglymodi
Clade:	Neoginglymodi
Order:	†Semionotiformes; Arambourg and Bertini, 1958
Families
	Dapediidae; Semionotidae; Hadrodontidae;

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

Timeline of genera

Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 363: 1–560. Retrieved 2011-05-17.