Simpsonichthys margaritatus

{{Short description|Species of killifish}}

{{Speciesbox

| image =

| status = DD

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) |date=2021 |title=Simpsonichthys margaritatus |volume=2021 |page=e.T141063522A141063541 |doi=10.2305/IUCN.UK.2021-1.RLTS.T141063522A141063541.pt |access-date=10 March 2024}}

| taxon = Simpsonichthys margaritatus

| authority = W. J. E. M. Costa, 2012

}}

Simpsonichthys margaritatus is a species of killifish from the family Rivulidae.Costa, W.J.E.M., 2012. Simpsonichthys margaritatus, a new seasonal miniature killifish from the upper Paraná River basin, central Brazilian Cerrado (Cyprinodontiformes: Rivulidae). Ichthyol. Explor. Freshwat. 22(4):313-318.{{cite journal |url=https://www.researchgate.net/publication/317222998 |journal=Zootaxa |volume=4263 |issue=1 |pages=165–172 |title=A new annual fish of the genus Simpsonichthys (Cyprinodontiformes: Cynolebiidae) from the upper Rio Jequitinhonha basin, Brazil |doi=10.11646/zootaxa.4263.1.8 |author1=Dalton Tavares Bressane Nielsen |author2=Tiago Casarim Pessali |author3=Guilherme Moreira Dutra |year=2017 |pmid=28609886 |access-date= 25 May 2022}} It is found in the Verde River floodplains, of the upper Paraná River basin in central Brazil.{{FishBase |genus= Simpsonichthys|species= margaritatus| month = February | year = 2015}}