Shorefishes of the Eastern Pacific online information system

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Species: Microdesmus hildebrandi, Dark-tailed worm-goby

All Families:   All Genera:   All Species:

snout square
eye tiny, high
plain color
C pointed, dark
lips fleshy, with large flanges
A 36
pectoral 10
scales 24 radiating lines

Microdesmus hildebrandi Reid, 1936

Dark-tailed worm-goby

Slender, wormlike, body height 5% of SL; tail (without fin) 61% of TL; eyes tiny, high on side of head, skin covered; front nostril a tiny pore in folds near mouth, rear nostril a hole above and before eye; lower jaw strongly projecting, with angular tip; lips fleshy, with pronounced flanges on sides; snout blunt and square; snout and entire lower jaw with pronounced longitudinal folds; teeth in 2 irregular rows; gill opening large (not tubular), longer than base of pectoral; dorsal fin spines evenly spaced, 55 elements, origin over tip of pressed-down pectoral; anal II, 36; pectoral 10 rays, fin long; pelvics I, 3, shorter than pectorals; tail fin pointed; dorsal and anal fins confluent with tail fin; scales small, non-overlapping well separated; body and head scaled except for lower jaws and snout, in oblique rows at bases of dorsal and anal fins; scales with 24 radiating ridges.

Body olive; fins plain, translucent; tail dark brown.

Size: 11 cm.

Habitat: rocky shores.

Depth: 0-10 m?

Known only from Panama.

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  • Brackish
  • Non Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom only
  • Bottom
  • Estuary
  • Soft bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Sand & gravel
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic larva
  • Benthic
  • No data
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • All species
  • East Pacific endemic
Regional Endemism
  • All species
  • Panamic province endemic
  • Continental TEP endemic
  • Continent only
  • TEP endemic
  • Continent
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Listed
  • Data deficient
  • Not listed
Length Max
  • 11
Depth Range Min
  • 0
Depth Range Max
  • 10