Species: Poecilia gillii, Molly molly, the molly

Poecilia gillii (Kner, 1863)

Molly

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, at front, slightly oblique, lower jaw slightly projecting, top jaw protractile; jaw teeth consist of an outer row of large backward curved teeth with expanded tips, and several rows of small pointed teeth, inner row of teeth with 1 point; 1 dorsal fin, 9-10 rays, with short base, at rear of body, fin enlarged and can be very long in male; pelvic origin well behind pectoral base, near anal fin; tip of pelvic fin of male swollen, elongate; pectorals high on flank, 14 or more rays, 5th ray not scalloped in male; anal fin 9 rays, origin under (female) or a little behind (male) dorsal fin origin; 3rd anal ray unbranched; anal fin modified in male to form an elongate sex organ, that organ short & with a straight tip that has small spines and a fleshy palp; tail base relatively narrow;  tail fin rounded, without elongate sword; scales smooth and relatively large, 27 (26-29) in longitudinal series, 16 around base of tail.