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Species: Peristedion nesium, Insular armored-searobin

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keel along side head: wide, ends in right-angle flange
snout plates thin, ~parallel, wide apart, 12-18% head
body white + red bars; D1 red
barbels: filamentous 32-44% head; others few, slender

Peristedion nesium Bussing, 2010

Insular armored-searobin

Head and body flattened below and completely covered in a heavy armor of bony plates and spines; bony keel along side of face wide, serrated, ends in a  right-angled flange; snout long, depressed; the pair of rostral spines projects forwards, almost parallel; nasal spine well developed; snout plates thin, parallel, widely spaced, very short, less than pupil length, 12.1-18.2% of head length; filamentous barbell 31.8-44.2% of head length, with filaments up to ½ its length; chin and lip barbels slender, few; gill rakers 33-40; dorsal fin divided into 2 parts, VIII + 16-18; pectoral fin with main fin (12) plus 2 free rays below; anal fin 0, 16-18; pelvic fins are wide apart, below base of pectorals, with I, 5 rays.

Head red, nape paler; body white, with 4-6 red bars, 1st bar broad, just behind pectorals; pectorals red to black, with thin white edge; spinous dorsal red, without a black blotch.

Reaches 14 cm.

Habitat: on soft bottoms.

Depth: 110-180 m.

Cocos Island.

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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Soft bottom only
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Bathydemersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Pelagic larva
  • No data
  • Pelagic
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • TEP oceanic island (s) endemic
  • Cocos Island endemic
  • Island (s) only
  • Island (s)
  • TEP endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Not evaluated / Listed
  • Not listed
Length Max
  • 14
Depth Range Min
  • 110
Depth Range Max
  • 180