meridionalis, Sclerognathus Günther [A.] 1868:23 [Catalogue of the fishes in the British Museum v. 7; ref. 1990] Río Usumacinta, Guatemala. Syntypes: BMNH 1865.4.29.58-61 (4), ZMB 7005 (2). •Mention -- (Miller 2006:150 [ref. 28615]). •Valid as Ictiobus meridionalis (Günther 1868) -- (Espinosa Pérez et al. 1993:23 [ref. 22290], Gilbert 1998:192 [ref. 23395], Nelson et al. 2004:79 [ref. 27807], Scharpf 2006:10 [ref. 30386], Page et al. 2013:80 [ref. 32708], López-Segovia et al. 2020:110 [ref. 38152], Barrientos et al. 2023:271 [ref. 41235], Page et al. 2023:64 [ref. 40505], Fricke et al. 2024:159 [ref. 41622], Quintana 2024:5 [ref. 41186]). Current status: Valid as Ictiobus meridionalis (Günther 1868). Catostomidae: Ictiobinae. Distribution: Southern North America and Central America: Río Papaloapan to Río Usumacinta basins, Gulf of Mexico slope (southern Mexico and Guatemala). IUCN (2019): Data Deficient. Habitat: freshwater.