Simpsonichthys rufus

{{Short description|Species of killifish}}

{{Speciesbox

| image =

| status = CR

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) |date=2022 |title=Hypsolebias rufus |volume=2022 |page=e.T186384A1812252 |doi=10.2305/IUCN.UK.2022-1.RLTS.T186384A1812252.pt |access-date=9 March 2024}}

| taxon = Simpsonichthys rufus

| authority = W. J. E. M. Costa, Nielsen & de Luca 2001

| synonyms = * Hypsolebias rufus (Costa, Nielsen & de Luca, 2001)

}}

Simpsonichthys rufus is a species of killifish from the family Rivulidae.Costa, W.J.E.M., D.T.B. Nielsen and A.C. de Luca, 1977. Quatro novos rivulideos anuais do gênero Simpsonichthys (Cyprinodontiformes) das bacias dos rios São Francisco e Pardo, Brasil. Rev. Fr. Aquariol. 4(1):24-31 It is found in the São Francisco River basin in Brazil.