Shorefishes of the Greater Caribbean online information system

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Species: Coryphopterus dicrus, Colon Goby, Colon Sand-goby

All Families:   All Genera:   All Species:

no dark spot over operculum
D2 & A: 9
pelvics united in V, no front membrane
C base: bar joins 2 spots
pectoral 18-20, base: 2 dark spots

Coryphopterus dicrus Bohlke & Robins, 1960

Colon Goby, Colon Sand-goby

Snout profile straight; head pores present, usually 1 between center of eyes, 1 pair between rear nostril; papillae on cheek in horizontal rows; mouth small, relatively horizontal; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VI + I, 9; length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin I, 9; pectoral rays 18-20; pelvic fins I, 5, rays branched, 5th much shorter than 4th, fins fused to form a disc, rear margin indented, somewhat V-shaped, adults with no anterior membrane between spines; tail fin rounded; body covered with scales, scales large, rough, absent from head, 26 in lateral series; no lateral line.

Translucent grey: eye with dark radiating lines; dark bar below eye; often several dark lines back from eye; a dark spot immediately behind eye; no dark spot above operculum; 10-11 dark spots on midline from head to tail base; sides with numerous pink, tan and yellow spots of varying size; tail fin base with a dark bar joining 2 spots; pectoral fin base with two dark spots, dorsal and ventral, upper spot usually with a black streak extending onto fin rays; vertical fins without any pattern; small spots in membrane of ventral fin.

Reaches: 5 cm.

Depth: 1-56 m.

Habitat: Coral reefs; prefers rocky areas between individual coral colonies.

Georgia to the S Caribbean; also Brazil.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Rocks
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef (rock/coral/oyster)
  • Reef and soft bottom
  • Reef associated (reef + edges-water column & soft bottom)
FishBase Habitat
  • Reef Associated
Feeding Group
  • Data
  • Detritivore
  • Omnivore
  • Data
  • Benthic microalgae
  • Detritus
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Benthic
  • Data
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 5
Depth Range Min
  • 1
Depth Range Max
  • 56