Shorefishes of the Eastern Pacific online information system

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Species: Dialommus macrocephalus, Foureye rockskipper

All Families:   All Genera:   All Species:

eyes & nape - no cirri
very elongate
eye divided
A II, 24

Dialommus macrocephalus (Günther, 1861)

Foureye rockskipper

Body very elongate; head large, angular, depressed; no cirri over eye or on nape; surface of eye divided by fleshy bar; teeth in jaws forming narrow bands; teeth on center but not sides of roof of mouth; dorsal fin XXII, 12-13, a notch between spines and rays; anal fin with II, 24, short, stout spines have a fleshy covering; scales very small, smooth, ~ 75 in lateral series.

Dark greyish with light and dark mottlings; head blackish; small white spots present on head, pectoral fin base, and upper back.

Maximum recorded size 11 cm.

Habitat: occurs in very shallow water along rocky shores.

Depth: 0-5 m.

The tip of Baja California and central Mexico to Colombia.

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Species Data Create Report Export as Word File Export as Excel File
  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Data
  • Insects
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • TEP endemic
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continental TEP endemic
  • Continent only
  • Continent
  • All species
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 11
Depth Range Min
  • 0
Depth Range Max
  • 5