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Species: Tomicodon humeralis, Sonora clingfish

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front nostril: small flap
D 8-9
pectoral 17-19
green + many thin oblique white bars
blotch above pectoral
anus nearer A than sucker

Tomicodon humeralis (Gilbert, 1890)

Sonora clingfish

Body relatively slender, elongate, head relatively slender (both viewed from above); front nostril with a small flap; upper jaw with 5-7 pairs of trifid incisors at front followed on each side by 2-4 well developed canines; lower jaw with 4-5 pairs of trifid incisors followed on each side by 3-4 well developed canines; anus much closer to anal fin origin than to rear margin of disc; pectoral 17-19 rays; only a small fleshy swelling at pectoral base; sucker disc with broad patch of papillae at front, no papillae in center, 6-8 rows of papillae across rear section; dorsal 8-9 rays; anal 6-7 rays; tail 9-10 rays.

Greenish brown with narrow white bars on sides and across back; also scattered dark spots on back; a large dark blotch above each pectoral fin base.

Size: attains 10 cm.

Inhabits rocky intertidal zone, reported to be capable of surviving for two days out of water if kept moist.

Depth: 0-5 m.

Western and northeastern Gulf of California.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Reef (rock/coral/oyster)
  • Rocks
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Zooplankton
  • Sessile molluscs
  • Mobile benthic gastropods/bivalves
  • Benthic microalgae
  • Mobile benthic crustacea (shrimps/crabs)
  • Data
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent
  • Continent only
  • Continental TEP endemic
  • Cortez province endemic
  • All species
  • TEP endemic
  • Resident
Climate Zone
  • North Temperate (Californian Province &/or Northern Gulf of California)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 10
Depth Range Min
  • 0
Depth Range Max
  • 5