Considered a synonym of Gobionellus microdon (Gilbert, 1892)
- Pezold, F.. 2004. "Redescription and synonymies of species of the American-West African genus Gobionellus (Teleostei, Gobiidae) with a key to species". Copeia. 2004(2):281-297 (ffm00447)
Original description as Gobionellus mystax:
- Ginsburg, Isaac. 1953. "Ten new American gobioid fishes in the United States National Museum, including additions to a revision of Gobionellus". Journal of the Washington Academy of Sciences. 43(1):18-26 (ffm00396)