Species: Gambusia luma, Sleek Mosquitofish

Gambusia luma Rosen & Bailey, 1963

Sleek Mosquitofish

Head and body moderately robust, moderately compressed at rear; head depressed; front nostril not tubular; covering of eye not continuous with skin of head; mouth small, opens at front, slightly oblique, lower jaw slightly projecting, top jaw protractile; jaw teeth consist of an outer row of large backward curved teeth, and several rows of small pointed teeth; 13-14 gill rakers; 1 dorsal fin with short base, at rear of body, 6-7 rays; anal fin origin distinctly before dorsal fin origin in both sexes, female with 10 rays; pelvic origin well behind pectoral base, near anal fin, tips of fins of males not swollen; pectorals high on flank, 14-15, modified in male, with 5th ray scalloped near its tip; 3rd anal ray unbranched; anal fin modified in male to form an elongate sex organ, tip of that organ curved upwards, with 2 long upward pointing claws on the top side, without a fleshy palp; tail base relatively narrow; tail fin rounded; scales smooth and relatively large; 29 in lateral series.

Light olive, body without dark spots; a dark oblique bar under eye; upper rear margin of tail fin in both sexes yellow-orange; dorsal and tail fins with dark spots that may form lines.

Reaches 5.5 cm.

Freshwater and brackish water.

Depth 0-1 m.

Belize to Honduras.