How to Identify Atlantic Sharpnose Shark

To identify Atlantic Sharpnose Shark (Rhizoprionodon terraenovae), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal surface is typically gray to grayish-brown, sometimes with a bronze tint. Ventral surface is white. Some individuals may have small, indistinct white spots on their sides, particularly juveniles.

Scale type

placoid

Mouth position

inferior

Distinctive features

Long, pointed snout, Small, serrated teeth in both jaws, Second dorsal fin originates over or slightly in front of the anal fin origin, No interdorsal ridge, Anal fin has a distinct notch on its posterior margin

Dorsal fin

Two dorsal fins. The first dorsal fin is moderately large, originating over the pectoral fin axil. The second dorsal fin is much smaller, originating over or slightly anterior to the anal fin origin.

Tail fin

Heterocercal caudal fin, with the upper lobe significantly longer than the lower lobe, and a distinct subterminal notch.

Pectoral fin

Moderately long and somewhat falcate (sickle-shaped).

Distinctive fins

No interdorsal ridge between the dorsal fins. The anal fin is smaller than the second dorsal fin and has a deep notch on its posterior margin.

Identification Tips

1. 1

   Snout

   Look for a noticeably long and pointed snout, which is a key characteristic distinguishing it from other small coastal sharks.

2. 2

   Dorsal Fins

   Observe the position of the second dorsal fin relative to the anal fin. In Atlantic Sharpnose Sharks, the second dorsal fin originates over or slightly in front of the anal fin origin. Also note the absence of an interdorsal ridge.

3. 3

   Teeth

   While difficult to observe in live specimens, the teeth are small and serrated in both jaws, a feature shared with other Rhizoprionodon species.

4. 4

   Size

   Adults are relatively small, typically under 1 meter in length, which helps differentiate them from larger shark species in their range.

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