aenigmaticum, Ophisternon Rosen [D. E.] & Greenwood [P. H.] 1976:52, Figs. 23-24 [Bulletin of the American Museum of Natural History v. 157 (art. 1); ref. 7094] About 13 kilometers southwest of Sebol, Alta Verapaz, Río Chajmaic, Guatemala. Holotype: AMNH 32410. Paratypes: AMNH 3286 (2), 8817 (ca 15), 17269SW (1 c&s), 18683 (3), 19584 (1), 24515 (1), 25145 (1), 25187 (1), 25403 (2), 25470 (2), 26271 (1), 30217 (1), 31502 (1), 31504 (4), 31508 (1), 31554 (1), 31573 (3), 31594 (3), 31619 (1), 31701 (1), 31723 (2), 32002 (2), 32017 (3), 32071 (4), 32096 (2), 32408 (3); UMMZ 104117 (1), 98883 (1), 158397 (1), 167700 (1), 190581 (2), 190711 (3), 190810 (2), 193885 (2). •Valid as Ophisternon aenigmaticum Rosen & Greenwood 1976 -- (Villa 1982:156 [ref. 36708], Lee et al. 1983:62 [ref. 22527], Espinosa Pérez et al. 1993:62 [ref. 22290], Greenfield & Thomerson 1997:138 [ref. 22947], Kullander in Reis et al. 2003:594 [ref. 27061], Smith et al. 2003:19 [ref. 27621], Nelson et al. 2004:113 [ref. 27807], Perdices et al. 2005:460 [ref. 28418], Miller 2006:323 [ref. 28615], Scharpf 2007:37 [ref. 30398], Matamoros et al. 2009:16 [ref. 31241], Page et al. 2013:115 [ref. 32708], Phillip et al. 2013:21 [ref. 32896], Angulo et al. 2013:998 [ref. 33194], Barrientos et al. 2015:4 [ref. 37653], López-Segovia et al. 2020:110 [ref. 38151], Angulo et al. 2023:38 [ref. 40676], Barrientos et al. 2023:273 [ref. 41235], Page et al. 2023:126 [ref. 40505], Quintana 2024:6 [ref. 41186], Arroyave et al. 2024:379 [ref. 41613]). Current status: Valid as Ophisternon aenigmaticum Rosen & Greenwood 1976. Synbranchidae. Distribution: Atlantic Slope of Southern North America, Central America and Caribbean islands: Belize, Costa Rica, Cuba, Guatemala, Honduras, Mexico, Saint Lucia (introduced), and Trinidad and Tobago. Habitat: freshwater.