Shorefishes of the Eastern Pacific online information system

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Species: Microdesmus intermedius, Long-tailed worm-goby

All Families:   All Genera:   All Species:

snout blunt
eye tiny, high
plain color
lips thick, with large flanges
A 43-49
pectoral 10-14
scales 31 radiating lines

Microdesmus intermedius Meek & Hildebrand, 1928

Long-tailed worm-goby

Slender, wormlike, body height 3-9% of SL; tail (without fin) 61-70% of TL; head deep; eyes tiny, high on side of head, skin covered; pores on cheek form a faint X; snout blunt and square, lower jaw only a little projecting; lips thick, with fleshy folds, flanges at sides of corner of mouth; teeth small, conical, close-set in 2 irregular rows; gill opening large (not tubular), longer than base of pectoral; dorsal fin spines evenly spaced, 66-68 elements, origin over rear ½ of pectoral; anal II, 43-49; pectoral 12 (10-14) rays; pelvics I, 3, shorter than pectorals; tail fin rounded, short; dorsal and anal fins confluent with tail fin; scales small, non-overlapping, well separated; body and head scaly except for snout and lower jaw; scales with 31 radiating ridges.

(Preserved fish) uniform olive; tail slightly dusky, other fins clear.

Size: 11 cm.

Habitat: rocky shores.

Depth: 0-10 m.

Costa Rica to Panama.

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