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Species: Monolene sessilicauda, Deepwater Flounder

All Families:   All Genera:   All Species:

head pointed
D 92-109; pectoral 11-14
C transverse oval blotch
gill rakers long & slender
pectoral short, barred, lower rays < top rays
LL arched

Monolene sessilicauda Goode, 1880

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 under front part of lower eye; teeth ~equally developed on eye- and blind-sides; gill rakers moderately elongate and slender, 8-10; 92-109 dorsal rays; 76-89 anal rays; pectoral fin rays not branched, fin short, 11-14 rays, lower rays shorter than top rays, no fin on blind side in adults; base of eye-side pelvic fin about equal to base of blind-side fin, situated on body midline, its origin slightly behind that of blind-side fin; scales rough on eye side, smooth on blind side; 88-94 lateral line scales; lateral line on eye side only, strongly arched above the pectoral, no branch under lower eye.

Body with scattered dark blotches that may form cross-bars, and a row of blotches along upper and lower body profiles; pectoral with dotted cross-bars; tail fin with central transverse oval dark blotch that may be broken into two bars.

Size: 18 cm.

Habitat: shell and mud bottoms.

Depth: 78-1046 m.

New England 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)
  • Continental primarily
  • Extends N + S of GC
  • Extends North of GC
  • Extends South of GC
  • GC non-endemic
  • Island (s)
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
  • Subtropical (23-35N, Florida / Carolinas / Bermuda)
  • Temperate (>35N)
  • Tropical (10-23N, Nicaragua / Cuba)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 18
Depth Range Min
  • 78
Depth Range Max
  • 1046