Shorefishes of the Eastern Pacific online information system

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Species: Acanthemblemaria atrata, Cocos barnacle-blenny

All Families:   All Genera:   All Species:

snout & lips whitish or red
body: dark saddles, blue dots

Acanthemblemaria atrata Hastings & Robertson, 1999

Cocos barnacle-blenny

Body elongate; short blunt head; spines on snout & under eye, top of head behind eyes covered with short spines; inner row of spines between eyes on a bony ridge; cirri on nostrils, over eyes (1 pair, with or without 1 branch), but not on nape; 2 rows of well-developed teeth on side of roof of mouth; dorsal XXII-XXV, 11-14; anal II, 23-26; pectoral 12-14 (usually 13) rays.

Color variable; body varies from dark brown, to black to translucent with bars; small blue spots on head & body; top lip with 1-2 pairs of iridescent blue spots; mating males with black wash over head, body & fins, with red lips, snout and upper front of dorsal fin.

Size: 3.8 cm.

Habitat: barnacles and worm tubes on rocky shores.

Depth: 0-30 m.

Only at Cocos Island.

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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Reef only
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Barnacles & worm tubes
FishBase Habitat
  • Reef Associated
Feeding Group
  • No Data
  • Planktivore
  • Carnivore
  • Zooplankton
  • Mobile benthic crustacea (shrimps/crabs)
  • Pelagic fish eggs
  • Data
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • All species
  • East Pacific endemic
Regional Endemism
  • TEP endemic
  • TEP oceanic island (s) endemic
  • Island (s) only
  • Island (s)
  • Cocos Island endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Vulnerable
  • Listed
  • Not listed
Length Max
  • 3.8
Depth Range Min
  • 0
Depth Range Max
  • 30