caddo, Fundulus Fast [K. M.], Hundt [P. J.], Alley [Z. D.] & Sandel [M. W.] 2025:318, Figs. 6A, 7A-B [Zootaxa 5604 (no. 3); ref. 41965] Caddo River at Caddo Gap, Montgomery Co., Arkansas, U.S.A., 34.39777, -93.62171. Holotype: JFBM 50603. Paratypes: JFBM, UAIC. •Valid as Fundulus caddo Fast, Hundt, Alley & Sandel 2025 -- (Schmitter-Soto et al. 2025:suppl. Tab. 1, p. 26 [ref. 42574]). Current status: Valid as Fundulus caddo Fast, Hundt, Alley & Sandel 2025. Fundulidae. Distribution: North America: Red, Ouachita and Saline River drainages, Ouachita Highlands (southeastern U.S.A.). IUCN (2025): Not Assessed. Habitat: freshwater.