Common names: goby (English), sleeper (English), guavina (Espanol), gobio (Espanol)
Erotelis armiger (Jordan & Richardson in Jordan, 1895)
Flathead sleeper, Armiger's goby
Body elongate, robust; head flat, wide; snout short, blunt; mouth very oblique, lower jaw projecting; teeth small conical, in several rows on jaws; gill membranes broadly joined to throat; preoperculum with a concealed hook at its lower rear corner; dorsal fin VI weak spines + I, 13, last rays longest, base of 2nd dorsal < distance from the end of that base to tail fin; anal fin 12, form like 2nd dorsal; pectorals short; pelvics I, 5, short, completely separated; tail fin long, broadly rounded, with many short but obvious, spiny rays at the top and bottom of its base; scales small, smooth, 90-110 in lateral series; head with very small scales; no lateral line.
Dark brown, paler below; covered with fine black dots; dorsals with pale membranes, rays with black bars; tail dusky brown; anal, pelvics and pectorals speckled, pectoral with dark base.
Size: 12.5 cm.
Habitat: soft bottoms.
Depth: 0-5 m.
The lower Gulf of California to Colombia.