Shorefishes of the Eastern Pacific online information system

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Species: Tomicodon petersii, Hourglass clingfish, Peter's clingfish

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front nostril: small flap
D 7-8
pectoral 19-21
fine brown mesh + irregular bars
blotch above pectoral
anus nearer A than sucker

Tomicodon petersii (Garman, 1875)

Hourglass clingfish, Peter's clingfish

Body relatively slender, elongate, head relatively slender (both viewed from above); front nostril with a small flap; upper jaw with 4-7 pairs of trifid incisors followed on each side by 1-2 well developed canines; lower jaw with 3-4 pairs of trifid incisors followed on each side by 1-2 well developed canines; anus closer to anal fin origin than to rear margin of disc; pectoral 20 (19-21) 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 7 (7-8) rays; anal 7 (6-7) rays; tail 9 (8-10) rays.
White with brown reticulum, thickened in places to form a series of irregular brown "hourglass" bars across dorsal surface; flank with long spots; a prominent dark brown spot above each pectoral fin.
Size: to 4.6 cm.
Inhabits rocky shores.
Depth: 0-5 m.
The eastern Gulf of California to northern Peru, the Galapagos and Cocos.
Note: T. petersii probably comprises at least three allopatric species: T. petersii from  El Salvador to Peru, a second, unnamed species from Mexico and another unnamed species from the Galapagos (and Cocos island?).

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Rocks
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
  • Reef only
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Data
  • Zooplankton
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
  • Benthic microalgae
  • Mobile benthic gastropods/bivalves
Egg Type
  • Benthic
  • Pelagic larva
  • No data
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • Continent
  • Continent + Island (s)
  • TEP endemic
  • All species
  • Island (s)
  • 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)
  • South Temperate (Peruvian Province )
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Depth Range Max
  • 5
Depth Range Min
  • 0
Length Max
  • 4.6