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Species: Pycnomma semisquamatum, Secret goby

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head depressed, white dots
body ~ 6 dark bars
C: oval, black bar at base
lower opercle - black spot
pelvics separate
belly - 2 cream bars

Pycnomma semisquamatum Rutter, 1904

Secret goby

Body elongate, compressed; head depressed, narrow between eyes; front and rear nostrils tubular, rear shorter than front; no barbels on head; side of head with 3 pores (none on preopercle), pores without fleshy flaps at rear margins; mouth terminal, oblique; first dorsal fin with VII spines + I, 10-11; anal rays I, 9-10; pelvic fins completely separate; tail fin oval, longer than head; scales rough, large, none on head; tail fin base with 4 large, very rough scales.

Mottled brownish; side of body with about 4-5 diffuse blackish, hourglass-shaped bars and black bar at base of tail fin; a pair of creamy-yellow bars below spinous dorsal fin; head with white spots and diagonal brown bars radiating from eye; a small black spot at bottom of gill cover; median fins with white spots on rays and white margin on both dorsal fins.

Size: reaches 6.3 cm.

Inhabits crevices and ledges of weed-covered rocky reefs.

Depth: 2-20 m.

The Central Gulf of California.

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  • Marine
  • Marine Only
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Reef (rock/coral/oyster)
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
FishBase Habitat
  • Reef Associated
Feeding Group
  • Carnivore
  • No Data
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • No Data
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • Cortez province endemic
  • Continent only
  • Continental TEP endemic
  • TEP endemic
  • All species
  • Continent
  • Resident
Climate Zone
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 6.3
Depth Range Min
  • 2
Depth Range Max
  • 20