Shorefishes of the Eastern Pacific online information system

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Species: Arcos erythrops, Rock-wall clingfish

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front nostril: flap broad, bushy
brown meshwork + blue spots, 2-3 dark bars at rear
top jaw + canines

Arcos erythrops (Jordan & Gilbert, 1882)

Rock-wall clingfish

Tadpole shaped, with flattened body and wide flattened head; front nostril with a broad, bushy flap; a few fleshy lobes under chin, but nowhere else on head; top lip broad, much wider at front than at sides; upper jaw with 2-4 pairs of lightly compressed incisors at front followed on each side by 2-4 weak canines; lower jaw with 4-5 pairs of incisors followed on each side by 3-4 canines; top jaw with a row of rounded incisors and a deep patch of small irregular teeth behind them; sucker very large, front and rear parts with a broad band of papillae, central part with 2 close-set patches of papillae, 9-14 rows of flattened papillae across front of sucker disc, 11-14 rows across rear of disc, 7-9 longitudinal rows on each central patch; a well developed flattened fleshy pad on pectoral base with a free posterior margin; dorsal rays 6-7; anal rays 6; pectoral rays 21-22; caudal rays 7-8.  

Greenish brown with intricate pattern of white, blue, and brown spots and intervening yellowish reticulum; 2-3 broad dark brown bars across rear portion of body.

Size: attains 5.4 cm.

Inhabits surge zone along rocky shores.

Depth: 0-15 m.

The Central Gulf of California to southern Mexico.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Reef only
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Data
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • Benthic microalgae
  • Zooplankton
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • Continent only
  • Continent
  • Cortez + Mexican provinces endemic
  • Continental TEP endemic
  • All species
  • TEP endemic
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 5.4
Depth Range Min
  • 0
Depth Range Max
  • 15