Species: Gambusia lemaitrei, Totumo Gambusia

Gambusia lemaitrei Fowler, 1950

Totumo Gambusia

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; 1 dorsal fin with short base, at rear of body, 7 rays; anal fin origin distinctly before dorsal fin origin in both sexes, female with 9 rays; pelvic origin well behind pectoral base, near anal fin, tips of fins of males not swollen; pectorals high on flank, 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 forward-ward pointing hooks near top of tip, without a fleshy palp; tail base relatively narrow; tail fin rounded; scales smooth and relatively large; 33 in lateral series; head very scaly, 1 row along cheek.

Olive brown, scales on upper body with dark edges; top of head dark brown; an inconspicuous dark line from shoulder to mid tail base; rear lower side of abdomen of female with distinct pale area; fins golden, dorsal and tail fins with small blackish spots on membranes, those on tail in 2-3 vertical rows.

Reaches 4.5 cm.

Fresh to brackish water, lagoon habitats.

Depth range: 0-2 m.

Known only from Totumo lagoon on coastal Colombia.