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Species: Gobiosoma nudum, Knob-chin goby

All Families:   All Genera:   All Species:

snout tip - fleshy knob
body brown + 8 narrow white bars, extend onto Ds
D 11; A 9; pectoral 20
barbels: chin 2, before eye 1
pores: opercle 0; preopercle 3
pelvic disc round
scales absent or 1-4 just behind pectoral base + 2 on base C

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; a tiny barbel before the eye; 1 pore between eyes; 0 pores over opercle; preopercle with 3 pores; front nostril tubular, rear with raised rim; mouth oblique; upper lip separated from snout by a groove along its top edge; no teeth on  roof of mouth; tongue round to blunt; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VII (none filamentous) + I, 11 (10-12) rays; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin I, 9 (8-9) rays; pectoral rays 20 (18-20); pelvic fins I, 5, fused in a round disc; scales usually absent (sometimes 1-4 scales just behind base of pectoral fin and two scales on base of tail fin); no lateral line.

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

Size: reaches 4.5 cm.

Depth: Inhabits tide pools and shallow rocky reefs; also in freshwater.

Depth: 0-10 m.

Note: An E Pacific species that has passed through the Panama Canal to the Atlantic entrance thereof.


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Salinity
  • Brackish
  • Non Marine
  • Freshwater
Inshore/Offshore
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
Habitat
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Freshwater
  • Reef and soft bottom
  • Estuary
  • Reef (rock/coral/oyster)
  • Sand & gravel
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • Data
Diet
  • Mobile benthic gastropods/bivalves
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic worms
Egg Type
  • Benthic
  • Pelagic larva
  • No data
Global Endemism
  • Exotic (Introduced)
  • Greater Caribbean non-endemic
Regional Endemism
  • Continent only
  • GC non-endemic
  • Exotic (Introduced)
  • Continent
Residency
  • Vagrant
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Listed
  • Data deficient
CITES
  • Not listed
Depth Range Min
  • 0
Depth Range Max
  • 10
Length Max
  • 4.5