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

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.