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Species: Fundulus persimilis, Yucatán killifish

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snout pointed, elongate
narrow dark bars: female 12-18, male 10-15
scales before eye
D 9-11, origin over/before A origin
N Yucatan
chin pores 8
gill rakers 6-8
lateral scales 34-36
Yucatan

Fundulus persimilis Miller, 1955

Yucatán killifish

Body slender, compressed; head flattened above, with straight to slightly concave upper profile; snout elongate, sharp, about twice eye diameter; cover of eye not continuous with head skin; front nostril not tubular; mouth small, narrow (<27% of head length), distinctly below level of center of eye, opens at front, oblique, top jaw twisted, protrusible, lower jaw projecting; 8 pores under chin; jaws with outer row of pointed conical teeth, inner band of simple teeth; gill rakers short, 6-8; no spines in fins; dorsal fin short based, its origin over anal fin origin in female, slightly before in male, 10 (9-11) rays; anal fin with 3rd fin ray branched, 9 (9-10) rays; pectoral with narrow base, rounded, inserted low on side, 18-19 rays; pelvics inserted well behind pectoral base; tail base slender; tail fin bluntly rounded; small smooth scales, 34-36 midlateral rows; area before eye with scales;  lateral line reduced to a series of pits along side of body.

Females with 12-18 narrow dark bars on side, 1st weak. Male with 10-15 narrow dark bars, 1st above pectoral fin base is ½ length of 2nd; fins darker than in female.

Reaches 15 cm (females distinctly larger than males).

Fresh to brackish water, in tidal lagoons.

Depth range: 0-1 m.

A tidal lagoon at Rio Lagartos on the northern Yucatán.


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Salinity
  • Non Marine
  • Brackish
Inshore/Offshore
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
Habitat
  • Estuary
FishBase Habitat
  • Demersal
Feeding Group
  • Omnivore
  • No Data
Diet
  • Benthic microalgae
  • Mobile benthic worms
  • Mobile benthic gastropods/bivalves
  • Insects
Egg Type
  • No data
  • Benthic
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • West Atlantic Endemic
  • Greater Caribbean endemic
Regional Endemism
  • Continent
  • Continent only
  • GC endemic
  • Gulf of Mexico endemic
Residency
  • Resident
Climate Zone
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Listed
  • Data deficient
CITES
  • Not listed
Length Max
  • 15
Depth Range Min
  • 0
Depth Range Max
  • 1