Sundayichthys

{{Short description|Extinct genus of fishes}}

{{Automatic taxobox

| fossil_range = {{fossilrange|346.7|330.9|Visean}}

| taxon = Sundayichthys

| authority = Gardiner, 1969

| type_species = Sundayichthys elegantulus

| type_species_authority = Gardiner, 1969

}}

Sundayichthys is an extinct genus of prehistoric bony fish that lived during the Carboniferous period (Visean age) in what is now South Africa. Fossils were recovered from the Upper Witteberg Series.J. J. Sepkoski, Jr. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560{{cite journal |last=Gardiner |first=Brian George |author-link=Brian G. Gardiner (biologist) |year=1969 |title=New palaeoniscoid fish from the Witteberg series of South Africa |journal=Zoological Journal of the Linnean Society |volume=48 |issue=4 |pages=423–452 |doi=10.1111/j.1096-3642.1969.tb00722.x}}