Pacific sharpnose shark – Rhizoprionodon longurio

Rhizoprionodon longurio, commonly known as the is a species of requiem shark found in the western Atlantic Ocean. This shark is distinguished by its sleek, slender body and its characteristic coloration, which often features a blend of gray and brown tones. It is a relatively small shark, with adults reaching a maximum size of around 110.0 cm.

Description & Characteristics

Rhizoprionodon longurio possesses a streamlined, fusiform body shape that allows for swift and agile movements in the water. Its snout is slightly pointed, and its eyes are large and round. The shark’s mouth is situated on a short, broad jaw, which is lined with rows of sharp, pointed teeth. Its pectoral fins are relatively long and slender, while its dorsal fins are more triangular in shape. The coloration of Rhizoprionodon longurio varies slightly between individuals, but generally consists of a grayish-brown back with lighter sides and a white belly.

Habitat and Occurrence

Rhizoprionodon longurio is a common inhabitant of coastal waters in the western Atlantic Ocean. Its range extends from North Carolina, United States, down to Brazil, making it a prevalent presence in this region. The species is most often found in shallow, inshore waters, particularly in estuaries, bays, and lagoons. It has also been observed in deeper waters, reaching depths of up to 100 meters.

Taxonomy

Rhizoprionodon longurio belongs to the Class: Elasmobranchii, Order: Carcharhiniformes, and Family: Carcharhinidae. Elasmobranchii, more commonly known as cartilaginous fishes, comprise a group of aquatic animals that possess a skeleton made primarily of cartilage rather than bone. Carcharhiniformes, the order that includes Rhizoprionodon longurio, is a diverse group of sharks characterized by having two dorsal fins and an anal fin. The Carcharhinidae family, also known as the requiem sharks, is a large family of sharks that are known for their sleek, streamlined bodies and their wide distribution in oceans around the world.

Feeding

Rhizoprionodon longurio is a carnivorous shark that primarily feeds on small fish, crustaceans, and cephalopods. Its diet is largely dependent on the availability of prey in its habitat. This species plays an important role in the food web, helping to regulate populations of smaller fish and other invertebrates.