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Species: Idiastion hageyi, Galapagos humpback scorpionfish

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humpbacked; large eye
head very spiny, spines branched, nape spiny
red + white spots
D spines I-III white
fin borders white
pectoral: center rays longest, 18

Idiastion hageyi McCosker, 2008

Galapagos humpback scorpionfish

Body behind head deep, humpbacked, compressed; head very bony, with strongly developed spines, often with multiple points, numerous large spines on top of head and nape; without pit behind eyes; head profile moderately steep; eye large, with a row of papillae nearly surrounding it; front nostril with a slender tentacle, slightly shorter than nostril tube; longitudinal ridge under rear of eye with 5 spines; uppermost  of 4 preopercular spine separated from others and longest; teeth small, simple, on sides and front of roof of mouth; small slit behind last gill arch; mouth large, slightly oblique; lower jaw slightly protruding with a front knob; in throat; dorsal fin XII (3rd spine longest, 9 branched rays; anal fin III, 6 branched rays; pectoral with longest rays in center, 18 rays, ray 1 & bottom 7-9 rays unbranched, lower, unbranched rays fleshy, with free tips; scales mostly rough; between eyes without scales; lateral line complete, with tubes on scales, 15-16 pored scales; 52 scale rows in longitudinal series; small swim bladder.

Head, body and fins uniformly reddish orange; head, body and pectoral base with distinct, irregular white blotches smaller than eye; dorsal fin with skin of spines white, membranes between spines I-III white; rear margin of soft dorsal, tail, anal and pectoral fins white; faint dark smudges on operculum, around eye, on nape, between eyes and along base of dorsal fin.

Reaches at least 11.8 cm.

Depth range: 522 m.

Lives on rock and sand bottom.

Known from a single specimen collected at the Galapagos.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef and soft bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Rocks
FishBase Habitat
  • Bathydemersal
Feeding Group
  • Carnivore
  • No Data
  • Octopus/squid/cuttlefish
  • No Data
  • Bony fishes
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • Pelagic
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Island (s) only
  • TEP endemic
  • Galapagos Islands endemic
  • TEP oceanic island (s) endemic
  • Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 11.8
Depth Range Min
  • 522
Depth Range Max
  • 522