Shorefishes of the Eastern Pacific online information system

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Species: Clarkichthys bilineatus, Flagtail worm-goby, Flagtail wormfish

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yellowish + 2 black stripes



Clarkichthys bilineatus (Clark, 1936)

Flagtail Wormfish, Flagtail Worm-goby

Body short, stubby, eel-like, with depth ~ 8% of SL; tail (without fin) shorter than head and body; teeth in 2 rows, chisel-like; nostrils tubular; lips not broad and fleshy; gill opening a small tube at pectoral base; dorsal fin origin over pectoral, first 2 spines short, close together, XVII-XIX, 28-32; anal fin II, 28-31; pectoral 11-12 rays; tail 17 segmented rays; pelvic 1, 3; dorsal and anal fins not united with tail fin; scales well separated, embedded, most abundant on front of body and along lateral stripe, sparse elsewhere on head and belly; fins scaleless

White to yellowish with 2 broad black stripes along head and body: one along midback from snout to top of tail, the other along mid side extending from tip of mouth, covering both jaws, passing under eye to upper operculum and thence middle of tail fin; top and bottom edges of tail black.

Size: 6.5 cm.

Habitat: high-salinity tidepools, and rocky and coral habitat.

Depth: 0-10 m.

The SE corner of the Gulf of Mexico to Ecuador, and the Galapagos and Cocos.

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  • Marine Only
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Reef only
  • Reef associated (reef + edges-water column & soft bottom)
  • Rocks
  • Reef (rock/coral/oyster)
FishBase Habitat
  • Reef Associated
Feeding Group
  • No Data
  • Carnivore
  • Zooplankton
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • No data
  • Pelagic larva
  • Benthic
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • TEP endemic
  • Continent
  • Island (s)
  • All species
  • Continent + Island (s)
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Data deficient
  • Listed
  • Not listed
Length Max
  • 6.5
Depth Range Min
  • 0
Depth Range Max
  • 10