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Species: Poecilia koperi, Olomina, Olomina Molly

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body ~10 dark bars
D 8, male - basal blotch + outer spots
tail base - irregular spots
male: C longitudinal spots
male: pelvic tips swollen, sex organ short, + long palp & (not visible) spines under straight tip
scales: laterales 25-26, 16 around tail base

Poecilia koperi Poeser, 2003

Olomina, Olomina Molly

Head stout, body relatively deep, 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 1-pointed; 1 dorsal fin with short base, at rear of body, 8 (rarely 7) rays, fin long, reaches tail base; pelvic origin well behind pectoral base, near anal fin; tip of pelvic fin of males swollen, elongate; pectorals high on flank, 14 or more rays, 5th ray not scalloped in male; anal fin 8 (rarely 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 (not visible externally) and a long fleshy palp; tail base relatively narrow; tail fin rounded, without elongate sword; scales smooth and relatively large; 25-26 lateral scales, 16 around tail base.

Maracaibo area: Male - body scales with dark edges; ~10 dark bars on rear of body and tail base; tail fin base covered with irregularly pigmented scales; tail fin with longitudinal spots; dorsal fin with a large dark blotch on basal ½ of fin, dark spots outside that. Female - body colored like male, but with body bars less evident; fins without spots. East of Paraguana Peninsula; body with 2-3 horizontal rows of spots, less conspicuous below; tail fin with spots on membranes, dorsal fin spotted on membranes.

Reaches 10 cm?

Fresh and brackish coastal waters.

Depth range: 0-1 m.


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  • Brackish
  • Freshwater
  • Non Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
  • Freshwater
FishBase Habitat
  • Demersal
Feeding Group
  • Data
  • Detritivore
  • Omnivore
  • Data
  • Benthic microalgae
  • Detritus
  • Insects
Egg Type
  • Data
  • Live birth
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • All species
  • Greater Caribbean endemic
  • West Atlantic Endemic
Regional Endemism
  • Caribbean endemic
  • Continent
  • Continent only
  • GC endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 10
Depth Range Min
  • 0
Depth Range Max
  • 1