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Species: Cerdale ionthas, Spotted worm-goby

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white + dense black reticulated spots
lower lip - V shaped side notch
gill opening tubular

Cerdale ionthas Jordan & Gilbert, 1882

Spotted Worm-goby

Body short, stubby, eel-like, body height ~ 10% of SL; mouth strongly oblique, lower jaw projecting; lower lip with a V shaped notch at center, no notch at side under front nostril; 2 rows of teeth on each jaw, conical outer row, chisel-like inner row; gill opening tubular; dorsal fin spines of equal height and spacing XI-XIII, 31-34 (usually XII, 32-33), origin in front of level of pectoral fin tips; anal rays 0, 27-31 (usually 29-31); pectoral rays 13-15 (usually 14); dorsal and anal fins unconnected to tail fin; scales separate to close-set and partly overlapping.

Overall whitish with a reticulation of heavy brown to blackish spotting and mottling, particularly on head.

Size: grows to 7.5 cm.

Habitat: occurs in very shallow water on rocky coasts, including tide pools.

Depth: 0-2 m.

Costa Rica to Ecuador.

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  • Marine
  • Brackish
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Mangrove
  • Reef and soft bottom
  • Rocks
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Reef (rock/coral/oyster)
  • Beach
  • Reef associated (reef + edges-water column & soft bottom)
  • Estuary
FishBase Habitat
  • Demersal
Feeding Group
  • No Data
  • Carnivore
  • Data
  • Zooplankton
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Benthic
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent only
  • Continent
  • Panamic province endemic
  • Continental TEP endemic
  • All species
  • TEP endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 7.5
Depth Range Min
  • 0
Depth Range Max
  • 2