Gyronchus

{{Short description|Extinct genus of fishes}}

{{Automatic taxobox

| fossil_range = Jurassic

| taxon = Gyronchus

| authority = Agassiz 1839

| type_species = Gyronchus oblongus

| type_species_authority = Agassiz, 1843

}}

Gyronchus is an extinct genus of prehistoric ray-finned fish from the Jurassic. This genus is currently treated as a wastebasket taxon used for pycnodonts like Macromesodon and Turbomesodon.{{Cite journal |last=Poyato-Ariza |first=F. J. |last2=Wenz. |first2=S. |date=2004 |title=The new pycnodontid fish genus Turbomesodon, and a revision of Macromesodon based on new material from the Lower Cretaceous of Las Hoyas, Cuenca, Spain |url=https://www.researchgate.net/publication/257170366_The_new_pycnodontid_fish_genus_Turbomesodon_and_a_revision_of_Macromesodon_based_on_new_material_from_the_Lower_Cretaceous_of_Las_Hoyas_Cuenca_Spain |journal=Mesozoic Fishes 3—Systematics, Paleoenvironments and Biodiversity. |pages=341–378}}