How to Identify Black Diamond Stingray

To identify Black Diamond Stingray (Potamotrygon leopoldi), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

The dorsal surface is typically a deep, velvety black to dark brown, adorned with distinct, often perfectly circular, white to yellowish-white spots. The size and distribution of these spots can vary, with some individuals exhibiting fewer, larger spots and others having numerous smaller ones. The ventral surface is usually off-white to cream.

Scale type

placoid

Mouth position

inferior

Distinctive features

Deep black background coloration with contrasting white to yellowish-white spots., Disc shape is typically round to slightly oval., Possesses a venomous caudal spine (barb) on the tail., Small, widely spaced eyes on the dorsal surface., Mouth and gill slits are located on the ventral surface.

Dorsal fin

Absent (true dorsal fins are not present in stingrays).

Tail fin

Long, whip-like tail with a venomous serrated spine (barb) located dorsally, followed by a caudal fin fold.

Pectoral fin

Modified into a large, flattened, circular to oval disc, forming the main body of the ray.

Distinctive fins

The pectoral fins are fused with the head and body, forming the characteristic disc. Pelvic fins are small and located at the base of the tail.

Identification Tips

1. 1

   Coloration and Pattern

   Look for the characteristic deep black body with distinct, often perfectly circular, white to yellowish-white spots. The intensity of the black and the clarity of the spots are key identifiers.

2. 2

   Disc Shape

   The disc is typically round to slightly oval, distinguishing it from some other Potamotrygon species with more angular or elongated discs.

3. 3

   Geographic Origin

   Its restricted distribution to the Xingu River basin is a crucial identifier, as other similar-looking species may originate from different river systems.

4. 4

   Absence of Ocelli

   Unlike some other freshwater stingrays (e.g., Potamotrygon motoro), P. leopoldi typically lacks ocelli (eye-spots) within its spots, though some variations may occur.

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