The Simpsonichthys radiosus lives in the benthopelagic, freshwater environment.
Simpsonichthys radiosus described Simpsonichthys radiosus sp. n. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the upper Rio Tocantins basin, central Brazil WILSON J. E. M. COSTA & GILBERTO C. More