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Species: Arcos rhodospilus, Rock clingfish

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front nostril: flap wide, branched
brown + mesh of red & blue lines & spots
top jaw no canines

Arcos rhodospilus (Günther, 1864)

Rock clingfish

Tadpole shaped, with flattened body and wide flattened head; front nostril with wide, branched flap; a few fleshy lobes under chin, but nowhere else on head; top lip broad, much wider at front than at sides; top jaw with a row of rounded incisors and a deep patch of small irregular teeth behind them, no canines, lower jaw with 4-6 pairs of incisors at front followed on each side by 2-4 canines;sucker very large, front and rear parts with a broad band of papillae, central part with 2 close-set patches of papillae, 5-8 rows of flattened papillae across front of sucker disc, 7-9 rows across rear of disc, 5-7 longitudinal rows along each central patch; a conspicuous fleshy pad on pectoral fin base with free posterior margin; dorsal rays 6-7; anal rays 5-7; pectoral rays 20-22.

Brownish with reticulum of blue and red lines and spots on back and sides; also scattered small white spots evident, these sometimes forming 4-5 bars across dorsal surface.

Size: reaches about 6 cm.

Inhabits rocky shallows.

Depth: 0-10 m.

El Salvador to Ecuador and Cocos and Malpelo.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef (rock/coral/oyster)
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic gastropods/bivalves
  • Benthic microalgae
  • Data
  • Zooplankton
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • TEP endemic
  • Continent
  • All species
  • Island (s)
  • Continent + Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 6
Depth Range Min
  • 0
Depth Range Max
  • 10