Shorefishes of the Greater Caribbean online information system

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Species: Urotrygon microphthalmum, Smalleye Round Ray, Smalleye Round Stingray

All Families:   All Genera:   All Species:

snout length ~1/3 disc width
disc top ~no denticles
tail: > disc, no row thorns

Urotrygon microphthalmum Delsman, 1941

Smalleye Round Ray, Smalleye Round Stingray

Disc round, length about equal to width; snout long (length before eyes ~33% of disc width), with a pointed tip; eye small, < spiracle; pectorals continuous around head; tail slender, tapering, its length greater than disc length, with a large venomous spine; no dorsal fins; tail fin an elongate oval, upper lobe low (height < 1/6 its length) upper and lower lobes not confluent; upper surface of disc and tail almost without denticles, no central row of spines along back and top of tail.

Upper surface uniform grey brown, tail fin distinctly darker; lower surface white.

Reaches ~30 cm TL.

Lives on sand and mud bottoms; found in estuaries, in brackish to salt water.

Depth range: 10-25 m.

Venezuela to the Amazon river.

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  • Brackish
  • Marine
  • Inshore
  • Inshore Only
Water Column Position
  • Bottom
  • Bottom only
  • Sand & gravel
  • Soft bottom (mud/sand/gravel/beach/estuary/mangrove/seagrass)
  • Soft bottom only
  • Estuary
  • Mud
FishBase Habitat
  • Demersal
Feeding Group
  • Carnivore
  • Data
  • Data
  • Mobile benthic crustacea (shrimps/crabs)
  • Mobile benthic gastropods/bivalves
  • Mobile benthic worms
Egg Type
  • Data
  • Live birth
  • No pelagic larva
  • No pelagic phase
Global Endemism
  • All species
  • Greater Caribbean non-endemic
  • West Atlantic Endemic
Regional Endemism
  • Also in Brazil
  • Continent
  • Continent only
  • Extends South of GC
  • GC non-endemic
  • All species
  • Resident
Climate Zone
  • Equatorial (0-10N, Costa Rica / Venezuela)
IUCN Red List
  • Least concern
  • Listed
  • Not listed
Length Max
  • 30
Depth Range Min
  • 10
Depth Range Max
  • 25