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Species: Lythrypnus alphigena, Cocos goby

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head: bars above, cream spots below
body: 10 narrow brown bars
C: 6 faint bars

Lythrypnus alphigena Bussing, 1990

Cocos Goby

Body deep and wide; head round; no crest along top of head and nape; mouth very oblique; head without pores; papillae around mouth, on cheeks and operculum and over eye; front nostril a long tube, rear nostril a raised rim; tongue round to blunt; 5-7 gill rakers; dorsal fin VI (1st spine filamentous)+ I, 12 rays; I, 10 anal rays; 21 pectoral rays; pectoral rays unbranched; pelvics fused into disc; tail fin short, round, with 17 segmented rays; scales rough, none on head, nape, chest and pectoral base; ~ 37 lateral scale rows.

Grey; body with 10 narrow brown bars with dark line in center and dark edges, and wider paler interspaces; 4 brown bars across top of head; cheeks and lower head with large cream spots in a brown reticulum; fins dusky; spinous dorsal black at rear; soft dorsal with diffuse dark streaks; tail with 6 faint vertical bars.

Size: 4.4 cm.

Habitat: rocky bottoms.

Depth: 90-150 m.

Cocos Island.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom only
  • Bottom
  • Reef (rock/coral/oyster)
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef only
  • Rocks
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Planktivore
  • No Data
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Zooplankton
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Island (s) only
  • Cocos Island endemic
  • All species
  • TEP endemic
  • TEP oceanic island (s) endemic
  • Island (s)
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 4.4
Depth Range Min
  • 90
Depth Range Max
  • 150