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Species: Axoclinus nigricaudus, Cortez triplefin

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no eye cirrus
body & tail base: 5 oblique black bars
male: mid-flank row black spots + black C

Axoclinus nigricaudus Allen & Robertson, 1991

Cortez triplefin

Body short, robust; head large; cirri on head small, simple, 1 pair over nostrils, none over eyes; no teeth on sides of roof of mouth; three dorsal fins (III + XII-XIII + 10-11); dorsal fin soft rays unbranched; anal fin II, 18; pelvic fins completely separate; lateral line gradually descending from upper edge of gill cover to midlateral axis, with 15-16 tubed scales followed by 18-19 notched scales; scales above lateral line about as wide as long; scales small, none on head, breast, belly, and base of pectoral fins; total scales in longitudinal series 36.

Green to brownish above, whitish below; five oblique brown to blackish bars on side including black band on tail base; tail fin clear, thin white bar at base; male: front 4 body bars reduced to black blotches along midline; tail fin black with thin white bar at base.

Size: to 4.8 cm.

Habitat: common in the rocky intertidal zone.

Depth: 1-5 m.

Western and NE Gulf of California.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Rocks
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • No Data
  • Mobile benthic worms
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • All species
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
Regional Endemism
  • Cortez province endemic
  • Continent only
  • Continent
  • Continental TEP endemic
  • All species
  • TEP endemic
  • Resident
Climate Zone
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 4.8
Depth Range Min
  • 1
Depth Range Max
  • 5