Species: Gobiosoma spilotum, Isthmian Goby
pores: opercle 2; preopercle 3
D2 I, 11; A 9; pectoral 18-19

Gobiosoma spilotum (Ginsburg, 1939)
Isthmian Goby
Body robust, head rounded, wider than deep; very small barbel near anterior nostril; rear nostril a tube <1/3 height of front tubular nostril; 1 pore between eyes; 2 pores over opercle; preopercle with 3 pores; upper lip separated from snout by a groove along its top edge; upper jaw with 4 rows of teeth, outer row enlarged, inner not enlarged, no canines; lower jaw with 4 rows of teeth, outer row not enlarged, inner row slightly enlarged, no canines present; no teeth on roof of mouth; gill membranes broadly joined to body under throat, with 5 rays; dorsal fin VII (none filamentous) + I, 11 (10-11); length of 2nd dorsal base > distance from 2nd dorsal base to tail fin; anal fin I, 9 (8-9); pectoral fins 18-19 (18-20) rays, oval; pelvic I, 5, a complete disk, oblong to ovate, extending 3/4 distance to anus; tail fin rounded with 16 segmented rays; lateral scale rows 27-28 (26-29); scales extend in a broad band to upper and lower bases of pectoral fin, with narrow anterior bare areas above and below that band; four rough scales on tail fin base; no lateral line.
Dimorphic in color; males uniformly dark grayish brown with a mid-lateral row of seven black dashes between the pectoral base and the tail fin, sometimes an eighth spot on the tail base; belly pale; head mottled; a dark vertical area behind and above the corner of the mouth, a dark vertical line along the preopercular margin, and three dark spots along the sides; lips and chin dark; females are mottled and appear barred, the seven irregular bars passing through the seven black spots which are less distinct; seven dark areas along the base of the dorsal fins; belly pale.
Size: 2.7 cm.
Habitat: coastal rock and algal habitats.
Depth: 0-2 m.
SW Caribbean.

High Resolution Map Download
- Salinity
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- Brackish
- Marine
- Inshore/Offshore
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- Inshore
- Inshore Only
- Water Column Position
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- Bottom
- Habitat
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- Rocks
- Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
- Submerged vegetation
- Reef (rock/coral/oyster)
- Reef and soft bottom
- Reef associated (reef + edges-water column & soft bottom)
- FishBase Habitat
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- Reef Associated
- Feeding Group
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- Carnivore
- Data
- Diet
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- Data
- Mobile benthic crustacea (shrimps/crabs)
- Mobile benthic gastropods/bivalves
- Mobile benthic worms
- Egg Type
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- Benthic
- Data
- Pelagic larva
- Global Endemism
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- All species
- Greater Caribbean endemic
- West Atlantic Endemic
- Regional Endemism
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- Caribbean endemic
- Continent
- Continent only
- GC endemic
- All species
- Residency
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- Resident
- Climate Zone
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- Equatorial (0-10N, Costa Rica / Venezuela)
- IUCN Red List
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- Endangered
- Listed
- CITES
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- Not listed
- Length Max
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- 2.7
- Depth Range Min
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- 0
- Depth Range Max
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- 2