margaritatus, Simpsonichthys Costa [W. J. E. M.] 2012:314, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 22 (no. 4); ref. 31750] Floodplains of Verde River, a tributary of Paranaíba River, upper Paraná River basin, Municipío de Serranópolis, Estado de Goiás, Brazil. Holotype: UFRJ 8339. Paratypes: UFRJ 8340 (1), 8341 (1). •Valid as Simpsonichthys margaritatus Costa 2012 -- (Nielsen et al. 2017:166 [ref. 35304]). Current status: Valid as Simpsonichthys margaritatus Costa 2012. Rivulidae: Cynolebiinae. Distribution: Floodplains of the Verde River, upper Paraná River basin, central Brazil. Habitat: freshwater.