* Gobionellus microdon Gilbert, 1892).

Palmtail Goby. To 18.3 cm (7.2 in) TL (Hernández-Roque et al. 2018). Tip of Baja California, and Gulf of California to Ecuador (Robertson and Allen 2015). Benthic; marine, brackish, to nearly fresh waters (Romero-Berny 2018); depth: 0–5 m (16 ft) (Robertson and Allen 2015).