Shorefishes of the Eastern Pacific online information system

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Species: Monolene dubiosa, Acapulco flounder, Asaedae flounder, Dark flounder

All Families:   All Genera:   All Species:

body elongate, tapering, depth 39+% SL
eyes close together, spineless crest between
D 75-85; A 56-64
pectoral 10-12, large black spot



Monolene dubiosa Garman, 1899

Acapulco flounder, Asaedae flounder, Dark flounder

Body elongate (depth 39-44% of SL), tapering to tail; snout very short (< eye); eyes on left side of head, close together, with a spineless crest between them; lower eye originates slightly before top eye; mouth short, ends ~ front edge lower eye; teeth ~ equally developed on jaws on both eye- and blind-sides; 75-85 dorsal rays; 56-64 anal rays; pectoral short, ~½ length of head, 10-12 rays, no pectoral on blind side in adults; base of eye-side pelvic slightly longer than base of blind-side fin, with origin behind lower eye; lateral line arched over pectoral fin; 67-83 lateral line scales.

Dark body and fins; pectoral tip with a large oval black spot bordered in front with white.

Size: 13.2 cm.

Habitat: shell and mud bottoms.

Depth: 90-209 m.

Southern Baja and the SE Gulf of California to Panama.

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  • Marine Only
  • Marine
  • Inshore Only
  • Inshore
Water Column Position
  • Bottom
  • Bottom only
  • Soft bottom only
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Sand & gravel
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • No Data
  • Bony fishes
  • No Data
  • Mobile benthic crustacea (shrimps/crabs)
Egg Type
  • Pelagic
  • No data
  • Pelagic larva
Global Endemism
  • East Pacific endemic
  • Tropical Eastern Pacific (TEP) endemic
  • All species
Regional Endemism
  • 3 provinces (Cortez + Mexican + Panamic) endemic
  • TEP endemic
  • All species
  • Continental TEP endemic
  • Continent only
  • Continent
  • 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
  • Listed
  • Least concern
  • Not listed
Length Max
  • 13.2
Depth Range Min
  • 90
Depth Range Max
  • 209