Isistius

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Isistius
Temporal range: 56–0 Ma[1]
Thanetian to Present
Isistius brasiliensis.jpg
Cookiecutter shark (I. brasiliensis)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Order: Squaliformes
Family: Dalatiidae
Genus: Isistius
T. N. Gill, 1865
Type species
Isistius brasiliensis
(Quoy & Gaimard, 1824)

Isistius is a genus of dogfish sharks in the family Dalatiidae. They are commonly known as cookiecutter sharks. Members of the genus are known for their unusual behaviour and dentition.[2]


Species[edit]

Habits[edit]

The cookiecutter sharks, or cigar sharks, are unusual in the manner in which they replace their teeth. Instead of replacing teeth singly as they get damaged or lost, for example in hunting, such sharks replace the whole set. They can repeat such replacement throughout their lifetimes.[3]


Cookiecutter sharks often attack large shoals of fish, but have been known to circle fishing vessels to get an easy meal. They are particularly notorious for biting small chunks off of a prey animal in passing. Large prey, such as swordfish and cetaceans, may bear several healed wounds from such bites.[4]

Weaker prey may be injured enough to be weakened until they are unable to swim properly. They then are prone to sinking, enabling these sharks to gorge. Isistius species can eat half of their own body weight at a time.

In unusual circumstances, cookiecutter sharks have been known to attack humans if they find them in their hunting grounds, and reports of their killing humans have been made; they circle them in great numbers while stripping their flesh.[citation needed]

See also[edit]

References[edit]

  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Chondrichthyes entry)". Bulletins of American Paleontology 364: 560. 
  2. ^ Jones, E. C. 1971. Isistius brasiliensis. a squaloid shark. the probable cause of crater wounds on fishes and cetaceans; Fish. Bull. 69.791-98.
  3. ^ Strasburg, Donald W.; The Diet and Dentition of Isistius brasiliensis, with Remarks on Tooth Replacement in Other Sharks; Copeia, Vol. 1963, No. 1, Mar. 30, 1963 (pp. 33-40) Published by: American Society of Ichthyologists and Herpetologists, Stable URL: http://www.jstor.org/stable/1441272
  4. ^ Papastamatiou Yannis P., Wetherbee, Brad M., O'Sullivan, John, Goodmanlowe Gwen D. Lowe, Christopher G.; Foraging ecology of Cookiecutter Sharks (Isistius brasiliensis) on pelagic fishes in Hawaii, inferred from prey bite wounds.; Environmental Biology of Fishes, Volume 88, Number 4, 361-368, doi:10.1007/s10641-010-9649-2