Shorefishes of the Eastern Pacific online information system

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Species: Gobulus hancocki, Sand-top goby

All Families:   All Genera:   All Species:

upper 1/3 white + dark spots , lower 2/3 dark brown
eye small
Ds separate, clear
D2 10-11; A 9-10
pectoral 16

Gobulus hancocki Ginsburg, 1938

Sandtop Goby

Slender, compressed body; distinctly depressed head; head without pores; eye small, <80% of snout length; mouth small, at front, oblique, lower jaw projecting, top jaw not extending beyond eye; teeth in bands on jaws, no canines; longitudinal and vertical rows of papillae on cheeks; dorsal fin VII+ I, 11 (10-11), 2 fins separate; anal fin I, 10 (9-10); pectoral fin 16 (15-17); pelvic fins I, 5, frenum between spines present as a low, thin membrane, with a well developed membrane connecting at least 1/3 of length of inner rays, all rays unbranched, not extending past anus, fins form a flat plate; tail short, rounded; no scales.

Dark brown lower 2/3 of head and body, dark pigment reaches well above midline of body; whitish above mottled with brown spots; whitish on belly; dark crescent shaped bar on base of tail fin in most specimens; dorsal, anal and pelvic fins clear.

Size: attains 2.5 cm.

Inhabits sand-rubble bottoms close to reefs.

Depth: 1-20 m.

Central Gulf of California to Colombia, Cocos Is.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Corals
  • Reef associated (reef + edges-water column & soft bottom)
  • Reef (rock/coral/oyster)
  • Sand & gravel
  • Reef and soft bottom
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Pelagic larva
  • No data
  • Benthic
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • Island (s)
  • Continent + Island (s)
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • All species
  • Continent
  • TEP endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 2.5
Depth Range Min
  • 1
Depth Range Max
  • 20