longignatus, Simpsonichthys Costa [W. J. E. M.] 2008:156, Figs. 1-2 [Ichthyological Exploration of Freshwaters v. 19 (no. 2); ref. 29874] Seasonal swamp in the Pacoti River floodplains, road CE-040, about 25 kilometers from Fortaleza, 3°53'51"S, 38°24'13"W, Municépio de Aquiraz, Estado do Ceará, Brazil. Holotype: UFRJ 6614. Paratypes: UFRJ 6615 (9), 6616 (4, c&s). •Valid as Hypsolebias longignatus Costa 2008 -- (Costa 2011:221 [ref. 31654], Abrantes et al. 2020:306 [ref. 37698], Abrantes et al. 2023:558 [ref. 40706]). Current status: Valid as Hypsolebias longignatus (Costa 2008). Rivulidae: Cynolebiinae. Distribution: South America: swamp next to Rio Pacoti, an isolated coastal basin, Ceará (Brazil). Habitat: freshwater.