How to Identify Ocellate River Stingray

To identify Ocellate River Stingray (Potamotrygon motoro), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

The dorsal surface is typically a brownish to yellowish-brown base color, adorned with numerous distinct, often ring-shaped or ocellated spots (ocelli) that are yellow, orange, or reddish, outlined in black. The ventral surface is usually white or cream-colored, sometimes with dark blotches near the disc margins.

Scale type

placoid

Mouth position

inferior

Distinctive features

Disc-shaped body, typically round to oval., Prominent ocellated spots on the dorsal surface., Long, whip-like tail with one or more venomous serrated spines., Small eyes located dorsally, followed by spiracles.

Dorsal fin

Absent

Tail fin

Long, slender, whip-like tail, typically longer than the disc, bearing one or more venomous serrated spines. No caudal fin.

Pectoral fin

Broad, flattened, forming the main disc of the body.

Distinctive fins

Pelvic fins are small and located at the posterior margin of the disc.

Identification Tips

1. 1

   Dorsal Pattern

   Look for the characteristic ocellated (eye-like) spots, which are typically yellow, orange, or reddish with a black outline, set against a brownish or yellowish background. The number, size, and intensity of these spots can vary geographically and individually.

2. 2

   Body Shape

   The disc is typically round to slightly oval. Distinguish from other Potamotrygon species by the specific pattern and coloration.

3. 3

   Tail

   Observe the long, whip-like tail, which is usually longer than the disc and contains the venomous spine(s). The tail lacks a caudal fin.

4. 4

   Ventral Surface

   The underside is typically white or cream, sometimes with dark blotches, especially towards the edges of the disc.

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