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Species: Monolene atrimana, Blackfin Flounder, Longfinned Deepwater Flounder

All Families:   All Genera:   All Species:

head pointed
D 119-125; pectoral 11-15
C large dark blotch
gill rakers short, stout
pectoral long, black, lower rays < top rays
LL arched

Monolene atrimana Goode & Bean, 1886

Blackfin Flounder, Longfinned Deepwater Flounder

Body elongate, tapering to tail; head relatively pointed; snout < eye; eyes on left side; between eyes narrow, with crest that lacks spines; mouth short, ends ~ front edge lower eye; teeth ~equally developed on eye- and blind-sides; gill rakers short and stout, 8; 119-125 dorsal rays; 98-108 anal rays; pectoral fin rays not branched, fin long (longer than head), lowermost rays shortest, 11-15 rays, no pectoral on blind side in adults; base of eye-side pelvic fin equal to base of blind-side fin, situated on body midline, its origin slightly behind that of blind-side fin; about 105 lateral line scales; lateral line on eye side only, strongly arched above the pectoral, no branch under lower eye.

Dark body and fins; pectoral black; a single large blotch on tail fin.

Size: 11 cm.

Habitat: shell and mud bottoms.

Depth: 90-570 m.

Florida to Brazil.

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  • Marine
  • Marine Only
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Mud
FishBase Habitat
  • Bathydemersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Data
  • Pelagic
  • Pelagic larva
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent + Island (s)
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 11
Depth Range Min
  • 90
Depth Range Max
  • 570