Shorefishes of the Eastern Pacific online information system

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Species: Pseudomyrophis micropinna, Plain worm-eel, Smallfin worm-eel

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very elongate
snout broad, swollen, overhanging
D origin ~ mid-trunk
tail: ~ 2/3 TL, flexible
C obvious, joins A & D
pectoral tiny ( < eye)

Pseudomyrophis micropinna Wade, 1946

Smallfin worm-eel, Plain worm-eel

Body elongate, wormlike, (depth ~ 3% of TL); tail much longer than head & body (~ 64% of TL); head long (~ 11% of TL), bluntly pointed, with papillae on snout & between eyes; eye small (~ 7% of head length), at side of head; front nostril tubular, pointing downwards, rear nostril an elongate pore before eye; teeth: small, close-set, curved back, 1 row on jaws & roof of mouth, small cluster at front top jaw; gill opening one lower ½ of side, slightly oblique oval; gill pouch expanded; dorsal origin ½ way between gill opening & anus; pectoral is a tiny (eye-length) flap behind top of gill opening; dorsal and anal low, confluent with short tail fin; tail tip flexible; lateral line from tip of snout, over eye to end of tail, at rear in groove, branches from both sides join across behind eye, on nape, branches behind eye along both jaws.

Pale tan, belly white

Size: 16 cm.

Habitat: soft bottom.

Depth: 80-200 m.

The SW Gulf of California and Costa Rica to Colombia.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Mud
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic
  • No data
  • Pelagic larva
Global Endemism
  • Tropical Eastern Pacific (TEP) endemic
  • East Pacific endemic
  • All species
Regional Endemism
  • TEP endemic
  • Continent only
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • Continental TEP endemic
  • Continent
  • All species
  • Resident
Climate Zone
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 16
Depth Range Min
  • 80
Depth Range Max
  • 200