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Dialommus fuscus Gilbert, 1891
Galapagos foureye blenny

Life   Vertebrata   Fish   Labrisomidae   Dialommus

Dialommus fuscus
© Copyright Ross Robertson, 2006 · 12
Dialommus fuscus

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Main identification features
  • head angular, with cirri; eyes above, divided
  • body very elongate, rounded
  • 2 rows pale blotches
  • lips and pectoral base white
Dorsal rays XXV, 13 to 15; anal rays I, 28, spine small thick, with fleshy cover; scales small, about 60 in lateral series; body very elongate, rounded, greatest depth 6.0-7.0 in standard length; head large, angular; cornea divided by an oblique pigmented band into an anterior lower half and posterior upper half; upper edge of eye with 1-4 slender cirri; each side of nape with a single short cirrus; teeth in jaws forming narrow bands; roof of mouth with single series at front, none on sides.

Generally light greenish to nearly black with series of 7-9 white blotches along base of dorsal fin, also diffuse white blotches along lower side; lips white and scattered white markings on head and pectoral fin, including a pair of large whitish areas on base of pectoral fin.

Size: grows to at least 12 cm.

Habitat: found in rocky areas of the intertidal zone, often seen above the water line resting on rocks.

Depth: 0-5 m.

Galapagos and Cocos Islands.

Abundance: Common.
Cites: Not listed.
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo).
Depth Range Max: 5 m.
Depth Range Min: 0 m.
Diet: mobile benthic crustacea (shrimps/crabs); Insects.
Eastern Pacific Range: Northern limit=6; Southern limit=-2; Western limit=-93; Eastern limit=-87; Latitudinal range=8; Longitudinal range=6.
Egg Type: Benthic; Pelagic larva.
Feeding Group: Carnivore.
FishBase Habitat: Demersal.
Global Endemism: Tropical Eastern Pacific (TEP) endemic; East Pacific endemic; All species.
Habitat: Reef associated (reef + edges-water column & soft bottom); Rocks; Reef (rock &/or coral); Reef only.
Inshore Offshore: Inshore; Inshore Only.
IUCN Red List: Not evaluated / Listed.
Length Max: 12 cm.
Regional Endemism: Island (s) only; Island (s); TEP endemic; TEP oceanic island (s) endemic; Multiple oceanic islands endemic; All species.
Residency: Resident.
Salinity: Marine; Marine Only.
Water Column Position: Bottom; Bottom only;

Scientific source:

Links to other sites

  • Allen , G.R. and Robertson, D.R., 1994., Fishes of the Tropical Eastern Pacific., Crawford House Press Pty Ltd:1-332.
  • Gilbert, C.H., 1891., Scientific results of explorations by the U. S. Fish Commission steamer "Albatross". A supplementary list of fishes collected at the Galapagos Islands and Panama, with descriptions of one new genus and three new species., Proc. U.S. Nat. Mus., 13:449-455.
  • Kendall , W.C. and Radcliffe, L., 1912., The shore fishes. Reports on the scientific results of the expedition to the eastern tropical Pacific, ... by the U.S. Fish Commission steamer ALBATROSS, from October, 1904, to March, 1905, Lieut. Commander L.M. Garret, U.S.N., Commanding. XXV., Mem. Mus. Comp. Zool., 35(3):75-171.
  • McCosker , J.E. and Rosenblatt, R.H., 1985., The inshore fish fauna of the Galßpagos Islands. In Key Environments-Galßpagos, ed. R. Perry., Pergamon Press:133-144.
  • McCosker, J.E., Stephens, J.S. and Rosenblatt, R.H., 2003., Cottoclinus canops, a new genus and species of blenny (Perciformes: Labrisomidae) from the Galßpagos Islands., Proc. Calif. Acad. Sci., 54:155-160.
  • Meek , S.E. and Hildebrand, S.F., 1928., The marine fishes of Panama. Part III., Field Mus. Nat. Hist., Zool. Ser. Publ., XV:709-1045.
  • Snodgrass , R. E. and Heller, E., 1905., Papers from the Hopkins Stanford Galapagos expedition, 1898-1899. XVII. Shorefishes of the Revillagigedo, Clipperton, Cocos and Galapagos Island., Proc. Wash. Acad. Sci., 6:333-427.


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Common name (e.g. trout)

Genus + Species (e.g. Gadus morhua)

Dialommus fuscus Gilbert , 1891

Gal├ípagos four-eyed blenny Upload your photos  and  videos
Pictures | Google image Image of Dialommus fuscus (Galápagos four-eyed blenny) Dialommus fuscus
Picture by Wirtz, P.

Classification / Names Common names | Synonyms | Catalog of Fishes ( gen. , sp. ) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Labrisomidae (Labrisomids)
Etymology: Dialommus: Greek, dialyo = separate, to move away + Greek, omma = eyes (Ref. 45335 ) .  More on author: Gilbert .

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; demersal.   Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Eastern Pacific: Galapagos Islands.

Size / Weight / Age

Maturity: L m   ?   range ? - ? cm

Biology     Glossary (e.g. epibenthic)

Intertidal, actively shuttling back and forth between rock pools and air (Ref. 31184 ). With acute vision to detect prey in the air (Ref. 94105 ). Treks on land as far as 30 m from the sea which it can remarkably carry on due to its physical adaptive modifications like, laterally flattened corneas to avoid myopia and thickening and filament enlargement of the gills for respiration out of water. Feeds on insects and shore crabs.

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Williams, Jeffrey T. | Collaborators

McCosker, J.E. , 1987. The fishes of the Galápagos Islands. Oceanus 30(2):28-32. (Ref. 9227 )

IUCN Red List Status (Ref. 120744 )

  Vulnerable (VU)  (D2); Date assessed: 25 May 2007

CITES (Ref. 115941 )

Not Evaluated

CMS (Ref. 116361 )

Not Evaluated

Threat to humans


Human uses

Fisheries: of no interest FAO(Publication : search ) | FishSource |

More information

FAO areas
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Food consumption
Common names
Spawning aggregation
Egg development
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Stamps, Coins Misc.
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Internet sources

Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes ( gen. , sp. ) | DiscoverLife | ECOTOX | Faunafri | Fishtrace | GenBank( genome , nucleotide ) | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Tree of Life | Wikipedia( Go , Search ) | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805 ):  PD 50 = 0.7500   [Uniqueness, from 0.5 = low to 2.0 = high]. Bayesian length-weight: a=0.00490 (0.00199 - 0.01208), b=3.09 (2.87 - 3.31), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245 ). Trophic Level (Ref. 69278 ):  3.3   ±0.44 se; Based on food items. Resilience (Ref. 69278 ):  . Vulnerability (Ref. 59153 ):  Low vulnerability (10 of 100) .

Entered by Luna, Susan M. Modified by Hilomen, Teresa Fish Forum
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