How to Identify Requiem Shark

To identify Requiem Shark (Carcharhinus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Typically grey to brownish-grey dorsally, fading to white or lighter shades ventrally. Some species may have distinctive fin markings (e.g., black tips).

Scale type

placoid

Mouth position

inferior

Distinctive features

Nictitating membranes over eyes, Precaudal pit present, No spiracles, Blade-like, often serrated teeth in upper jaw; narrower, erect teeth in lower jaw

Dorsal fin

Two dorsal fins; the first is typically large, erect, and triangular, originating over or slightly behind the pectoral fin insertion. The second dorsal fin is much smaller, originating over or slightly anterior to the anal fin.

Tail fin

Heterocercal caudal fin, with the upper lobe significantly longer than the lower lobe, often with a distinct ventral notch near the tip of the upper lobe.

Pectoral fin

Large, triangular to falcate pectoral fins, typically originating below the fifth gill slit.

Distinctive fins

Anal fin present, usually smaller than the second dorsal fin. Pelvic fins are relatively small.

Identification Tips

1. 1

   First Dorsal Fin

   Observe its size, shape, and position relative to the pectoral fins. This is a key distinguishing feature among Carcharhinus species.

2. 2

   Interdorsal Ridge

   Presence or absence of a dermal ridge between the first and second dorsal fins is crucial for species identification within the genus.

3. 3

   Fin Markings

   Look for distinctive black tips, white edges, or other color patterns on the fins, especially the pectoral, dorsal, and caudal fins.

4. 4

   Tooth Morphology

   While requiring close examination, the shape, serration, and number of teeth are definitive for species identification.

5. 5

   Body Proportions

   Relative lengths of snout, eye size, and gill slit length can aid in distinguishing species.

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