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Species: Axoclinus rubinoffi, Rubinoff's triplefin

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body: 3 bars, darker at rear
C & tail base: black

Axoclinus rubinoffi Allen & Robertson, 1992

Rubinoff'S Triplefin

Body short, robust; head large; cirri on head small, simple, 1 pair over nostrils, 1 pair over eyes; no teeth on sides of roof of mouth; three dorsal fins (III + XII + 10); dorsal fin soft rays unbranched, except last ray branched to base; anal fin II, 17-18; pelvic fins completely separate; lateral line gradually descending from upper edge of gill cover to midlateral axis, with 22-23 tubed scales followed by 12-13 notched scales; scales above lateral line about wide as long; scales small, none on head, breast, belly, and base of pectoral fins; total scales in longitudinal series 35-36.

Body with three broad brown to blackish bars and blackish band on caudal peduncle, bars narrowly margined with pearl white, particularly posterior ones; narrower pale brownish bars between dark bars; male with blackish tail fin that is confluent with dark bar on tail base.

Size: grows to about 3.5 cm.

Inhabits shallow intertidal rocky areas.

Depth: 0-15 m.

Known only from Isla Malpelo.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic crustacea (shrimps/crabs)
  • No Data
  • Mobile benthic worms
  • Mobile benthic gastropods/bivalves
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • All species
  • East Pacific endemic
Regional Endemism
  • TEP oceanic island (s) endemic
  • Island (s)
  • Island (s) only
  • TEP endemic
  • All species
  • Malpelo Island endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Vulnerable
  • Listed
  • Not listed
Length Max
  • 3.5
Depth Range Min
  • 0
Depth Range Max
  • 15