mystax, Gobionellus Ginsburg [I.] 1953:23 [Journal of the Washington Academy of Sciences v. 43 (no. 1); ref. 1806] Laguna de Mexcalititan, Territory of Tepic (now the state of Nayarit), Mexico. Holotype: USNM 130859. Paratypes: USNM 123235 (1). •Valid as Gobionellus mystax Ginsburg 1953 -- (Castro-Aguirre et al. 1999:446 [ref. 24550]). •Synonym of Gobionellus microdon (Gilbert 1892) -- (Pezold 2004:290 [ref. 27686]). Current status: Synonym of Gobionellus microdon (Gilbert 1892). Gobiidae: Gobionellinae. Habitat: freshwater, brackish, marine.