Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Classis: Chondrichthyes
Subclassis: Elasmobranchii
Infraclassis: Euselachii
Division/Cohort: Neoselachii
Subdivision/Subcohort: Selachimorpha
Superordo: Squalomorphii
Ordo: Squaliformes
Familia: Dalatiidae
Genus: Isistius
Species: I. brasiliensis – I. labialis – I. plutodus
Name
Isistius Gill, 1865
Type species: Isistius brasiliensis (Quoy & Gaimard, 1824)
References
Meng, Q.-W., Zhu, Y.-D. & Li, S. 1985. A new species of Dalatiidae (Squaliformes) of China. Acta Zootaxonomica Sinica 442–444. Reference page.
Links
Isistius in the World Register of Marine Species
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
Isistius brasiliensis Quoy & Gaimard, 1824 (cookiecutter shark)
Isistius plutodus Garrick & S. Springer, 1964 (largetooth cookiecutter shark)
†Isistius triangulus Probst, 1879
†Isistius trituratus Winkler, 1876
Habits
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.
See also
List of prehistoric cartilaginous fish
References
Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Chondrichthyes entry)". Bulletins of American Paleontology. 364: 560. Archived from the original on 2011-09-30.
Jones, E. C. 1971. Isistius brasiliensis. a squaloid shark. the probable cause of crater wounds on fishes and cetaceans; Fish. Bull. 69.791-98.
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: https://www.jstor.org/stable/1441272
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
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