Shorefishes of the Eastern Pacific online information system

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Species: Entomacrodus chiostictus, Notchfin Blenny, Rock Blenny

All Families:   All Genera:   All Species:

snout rounded, overhanging
top lip wrinkled
D: deep notch
LL: short arch over pectoral
lower head - thin bars
flank - row square dark blotches

Entomacrodus chiostictus (Jordan & Gilbert, 1882)

Notchfin Blenny, Rock Blenny

Body very elongate; head short and blunt; snout rounded, overhanging; simple cirrus over front nostril; eye cirrus with 1-10 tips (more in larger fish); 1 pair of slender cirri on nape;no fleshy crest on head; many movable teeth on each jaw; teeth on front of roof of mouth; lower surface of top lip wrinkled at sides; gill openings broad, forming a fold across throat; gill rakers 14-20; dorsal fin with deep notch between spiny and soft parts, XIII spines, but the last one tiny and hard to see, 14-16 (usually 14-15); anal rays II, 15-17 (usually 16); pectoral rays 14; some tail fin rays branched; lateral line is a short arch over pectoral; no scales.

Olive on back, white on lower sides; a longitudinal row of square to rectangular black blotches along middle of side; upper front of body with small dark spots, all body with white spots and flecks; thin brown bars on snout, lips, and cheeks.

Size: reaches 8 cm.

Inhabits intertidal rocky reefs, including tide pools.

Depth: 0-2 m.

Central Gulf of California to Colombia, also all the offshore islands.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Rocks
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Reef (rock/coral/oyster)
  • Corals
FishBase Habitat
  • Reef Associated
Feeding Group
  • Detritivore
  • Herbivore
  • Data
  • Detritus
  • Data
  • Benthic microalgae
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • Island (s)
  • All species
  • Continent + Island (s)
  • Continent
  • TEP endemic
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 8
Depth Range Min
  • 0
Depth Range Max
  • 2