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Species: Kryptolebias marmoratus, Mangrove Rivulus

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body: checkerboard of dark spots
hermaphrodite: ocellus top rear C base
A 10-13
lateral scales 47-51



Kryptolebias marmoratus (Poey, 1880)

Mangrove Rivulus

Body elongate, cylindrical; head flattened; sensory system on top of head with grooves and exposed pads rather than pores; covering of eye partly continuous with skin of head; mouth slightly upturned, at front, short, not reaching under eye, top jaw extendible; teeth small, weak, conical; front nostril in a forward projecting tube that extends beyond front profile of head, rear nostril a small slit before and above eye; 9 lower gill rakers; fins without spines, although 1st ray may be unbranched; dorsal fin at rear of body, its origin over base of last few anal rays; dorsal fin 8-11, edge rounded; anal fin 10-13, edge rounded; pelvics on abdomen, at rear, 6 rays; pectorals rounded, on mid-side, 13; tail fin rounded, 30-31 rays; body with smooth scales, 47-51 along side; lateral line reduced to sensory pits along side of body; fertilization internal, with eggs then being laid.

Light to dark brown, with irregularly arranged dark spots forming a checkerboard pattern along upper side and all of tail base; a dark spot on side just above base of pectoral fin. Hermaphrodite: with a row of silver to gold spots along flank; a large dark cream ringed ocellus a little below the top of the tail fin base; Male: with a orangish cast to side of body and fins, upper and lower margins of tail fin not distinctly colored.

Reaches 6 cm.

Lives in shallow mangrove lagoons and hypersaline ponds; emerges from the water and can occur in abundance in burrows made by insects in red mangrove logs.

Depth range: 0-2 m.

Florida to Brazil.

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  • Brackish
  • Hypersaline
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Estuary
  • Mangrove
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Benthic
  • Data
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 6
Depth Range Min
  • 0
Depth Range Max
  • 2