The Cookie Cutter Shark, Isistius brasiliensis, is a small, bioluminescent shark known for its distinctive feeding habits. Its name derives from its circular bite marks, which resemble the shapes cut out by cookie cutters. This unique shark plays a crucial role in the marine ecosystem, often inhabiting the deep waters of the open ocean.
Description & Characteristics
The Cookie Cutter Shark, Isistius brasiliensis, is a relatively small species, reaching a maximum size of 42.0 cm. Its body is cylindrical and elongated, with a distinctive dark brown to black coloration. The shark possesses large, prominent eyes that are adapted for low-light conditions, reflecting its deep-water habitat.
Habitat and Occurrence
The Cookie Cutter Shark, Isistius brasiliensis, is a common inhabitant of the pelagic zone, found in the open ocean. This species has a wide depth range, occurring from the surface to depths of 3700 meters. It is particularly prevalent in mesopelagic and bathypelagic zones, where it encounters its prey.
Taxonomy
The Cookie Cutter Shark, Isistius brasiliensis, belongs to the family Dalatiidae, commonly known as the “kitefin sharks.” This family is further classified within the order Squaliformes, which encompasses a diverse group of sharks known as “dogfish sharks.” The Cookie Cutter Shark, Isistius brasiliensis, is a member of the Class: Elasmobranchii, a class that encompasses all sharks, rays, and skates.
Feeding
The Cookie Cutter Shark, Isistius brasiliensis, is a carnivore and a predatory species. Its primary method of feeding involves biting chunks out of larger fish and marine mammals using its sharp, serrated teeth. The shark’s distinctive circular bite marks are a result of its unique feeding technique, leading to its common name. This shark is considered a significant predator in its deep-water habitat, playing a role in regulating the populations of its prey.
Image References