enigmaticus, Atlantirivulus Volcan [M. V.], Suárez [Y. R.], Severo-Neto [F.], Amorim [P. F.] & Costa [W. J. E. M.] 2024:94, Figs. 2-5 [Zoologischer Anzeiger v. 312; ref. 41345] Unnamed first order stream, in the headwaters of the Iguirá-Moroti River along the border of road MS 386, Iguatemi River basin, municipality of Amambaí, Mato Grosso do Sul State, Brazil, 23°29'01"S, 54°51'45"W, elevation about 300 meters. Holotype: ZUFMS 8323. Paratypes: UFRJ, ZUFMS. •Valid as Atlantirivulus enigmaticus Volcan, Suárez, Severo-Neto, Amorim & Costa 2024. Current status: Valid as Atlantirivulus enigmaticus Volcan, Suárez, Severo-Neto, Amorim & Costa 2024. Rivulidae: Rivulinae. Distribution: South America: Iguatemi River drainage, Paraná River basin, Mato Grosso do Sul State, Brazil. Habitat: freshwater.