Shorefishes of the Eastern Pacific online information system

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Species: Pseudogramma thaumasia, Black-spot reef-bass, Pacific reef-bass

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long thin flap over eye
body: thin dark lines
white bar on cheek
pectoral: 16-17

Pseudogramma thaumasia (Gilbert in Jordan & Evermann, 1900)

Pacific reef-bass, Black-spot reef-bass

Body elongate, compressed; head short, compressed, forehead convex; upper edge of eye with long, slender flap; mouth slightly oblique, reaches past rear of eye; small simple teeth in bands on jaws and center (V shaped) and sides of roof of mouth, with 1-2 pairs of small canines at front of top jaw; preoperculum with large spine at upper angle, no serrations; operculum without visible spines; gill opening restricted above by fusion of operculum to body, a flap extending back from upper operculum to beyond pectoral base; 15 rakers on 1st  gill arch; dorsal VII (rarely VIII), 20-24, spines low, fin base long, end of soft part rounded; anal III, 17-20, long base, end of soft part rounded; pectoral 16-17 rays, rounded; pelvic I, 5, inserted under pectoral base; tail rounded; lateral line interrupted below posterior part of soft dorsal fin, reappearing lower down on side; scales small, rough; midlateral scales 48-55.

Body brown with darker scale centres often giving the appearance of fine dark longitudinal lines on sides; may also have pale blotches on rear of body; head pale brown or tannish with 2-3 brown bands bordering an oblique whitish bar behind and below eye; a prominent black spot on opercle.

Size: attains 10 cm.

Habitat: a secretive dweller of rocky crevices.

Depth: 3-40 m?

Central Gulf of California to northern Peru, Cocos, Malpelo and Galapagos.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Rocks
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Data
  • Carnivore
  • Bony fishes
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic larva
  • Pelagic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • All species
  • East Pacific 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)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 10
Depth Range Min
  • 3
Depth Range Max
  • 40