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Species: Pythonichthys asodes, Pacific mud-eel

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tiny eyes
mouth long, opens at front
D origin over gill opening
tail ~ 3/4 TL
D & A join soft C
no pectoral
gill opening low
no LL

Pythonichthys asodes Rosenblatt & Rubinoff, 1972

Pacific mud-eel

Body moderately elongate, circular in cross-section at front;  tail ~ 75% of TL, with tip at lower edge; a long blunt head (25-33% of body length), with a low skin ridge on side of snout before eye; tiny, skin-covered eyes; front nostril round, with a raised rim, rear nostril a slit just before and above eye; mouth 25-33% of head length, extends well past eye, with more or less equal jaws, with a pair of fleshy folds on its roof and papillae on top lip before front nostril; teeth in 2-3 rows on upper jaws, continuous with those on roof of mouth; no pectoral fin; gill openings are crescents low on the body; dorsal and anal fins low and confluent with the tail; dorsal fin origin over the gill opening;  no lateral line; no scales.

Tan to red-brown, with black fins.

Size: 54 cm.

Habitat: mud, estuarine/marine.

Depth: 7-30 m.

SE Gulf of California to Panama.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Estuary
  • Soft bottom only
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Mobile benthic worms
  • Mobile benthic crustacea (shrimps/crabs)
  • No Data
  • Mobile benthic gastropods/bivalves
Egg Type
  • Pelagic
  • No data
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • All species
  • Tropical Eastern Pacific (TEP) endemic
Regional Endemism
  • Continent only
  • Continent
  • All species
  • TEP endemic
  • Continental TEP endemic
  • Mexican + Panamic provinces endemic
  • Resident
Climate Zone
  • Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo)
  • Northern Tropical (Mexican Province to Nicaragua + Revillagigedos)
  • Northern Subtropical (Cortez Province + Sinaloan Gap)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Depth Range Min
  • 7
Depth Range Max
  • 30
Length Max
  • 54