Shorefishes of the Eastern Pacific online information system

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Species: Gobiosoma nudum, Knob-chin goby

All Families:   All Genera:   All Species:

mid-snout: 1 papilla
female: body & Ds: ~ 8 dark & white bars
male:dark, D - white border
chin: 2 barbels
2-3 bars under eye
scales: 0-4 behind pectoral + 2 on C base

Gobiosoma nudum (Meek & Hildebrand, 1928)

Knob-chin goby

Body robust; head rounded; snout blunt; tip of snout with a small central fleshy knob; chin with 2 small barbels; mouth oblique; tongue round to blunt; front nostril tubular, rear with raised rim; dorsal fin VII (none filamentous) + I, 11-12 rays; anal I, 9 rays; pectoral rays 18-20; pelvics fused in disc; scales usually absent (sometimes 1-4 scales just behind base of pectoral fin and two scales on base of tail fin).

Head and body with ~8 grey-brown irregular bars that have numerous pales spots superimposed on them; midlateral row of small elongate dark spots in middle of each dark bar.

Size: reaches 4.5 cm.

Inhabits tide pools and shallow rocky reefs.

Depth: 0-10 m.

The mouth of the Gulf of California to Colombia.

A species that has passed through the Panama Canal to the Atlantic.

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  • Brackish
  • Non Marine
  • Freshwater
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Estuary
  • Reef and soft bottom
  • Freshwater
  • Reef (rock/coral/oyster)
  • Sand & gravel
FishBase Habitat
  • Reef Associated
Feeding Group
  • No Data
  • Carnivore
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Data
  • Mobile benthic worms
Egg Type
  • Benthic
  • Pelagic larva
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • Continent
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • TEP endemic
  • Continent only
  • Continental TEP endemic
  • All species
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Listed
  • Data deficient
  • Not listed
Length Max
  • 4.5
Depth Range Min
  • 0
Depth Range Max
  • 10