Shorefishes of the Eastern Pacific online information system

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Species: Malacoctenus costaricanus, Costarican Blenny

All Families:   All Genera:   All Species:

D dark front, 1st spine long, XIX
body 6 bars; flank: series rows of dots
wide space between nape cirri
behind chin 4-7 pores
A: 19
LL 50-51
scales before D & on pectoral base

Malacoctenus costaricanus Springer, 1959

Costarican Blenny

Head slender, snout pointed; 4-7 pores under head between insertions of opercular flaps; a pair of heavily branched nape cirri, space between those > 4 times width of a cirrus base; a branched cirrus over eye; upper part of rear end of top jaw covered by bone under eye; no small teeth behind outer row of large teeth on upper jaw; no teeth on sides of roof of mouth; gill rakers 10-11; dorsal fin XIX, 11, 1st spine long, > 11% SL, notch between spines and rays; anal II, 19; pectoral 13-14 (usually 14) rays; 3 pelvic soft rays, length of shortest ray 50-55% longest ray; 50-51 lateral line scales; belly scales smaller than flank scales; 1 or more scales on top of nape in front of dorsal fin, and on lower margin of pectoral base, and sometimes on breast.

Head light, with dark spots behind eye & on gill cover; body with 6 irregular bars, darker above midline & extending onto dorsal fin; adults with multiple longitudinal series of small spots along flank; front of dorsal fin dark, rear with scattered spots; tail fin with irregular bars, with dark spots and dark rear tips of upper 2 and lower 2 rays.

Size: 6.2 cm.

Habitat: coastal rocky areas.

Depth: 1-10 m?

El Salvador to Costa Rica.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Benthic
  • No data
  • Pelagic larva
Global Endemism
  • All species
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
Regional Endemism
  • Panamic province endemic
  • Continent only
  • All species
  • Continent
  • TEP endemic
  • Continental TEP endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 6.2
Depth Range Min
  • 1
Depth Range Max
  • 10