Mako shark

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Mako sharks are predatory mackerel sharks of the genus Isurus (meaning "equal tail")[2]. They are largely pelagic,[3] and are fast, predatory fish capable of swimming at speeds of up to 50 km/h (31 mph).[4][5] Both mako sharks are sexually dimorphic, with females being larger than males, and are large sharks. Both species of mako shark are classified as "Endangered" by the IUCN.

Two species of mako shark currently exist: The shortfin mako shark, and the longfin mako shark. The shortfin mako shark is the fastest shark in the world, capable of speeds of 74 km/h (46 mph) in bursts, and, while the longfin mako shark is larger and slower of the two mako, it reaches upwards of 2.5 m (8.2 ft) in length and weighs over 70 kg (150 lb), and is the second largest shark in its family Lamnidae, after the great white shark.[6]

Fossil history and evolution

Although fossil teeth of Isurus have been reported from as early as the Late Cretaceous,[7][8] they are likely to be of a shark with a similar dentition, Cretoxyrhina; since at one point they were considered to be the same (now defunct) genus Oxyrhina,[9] and modern referrals to Isurus in the Cretaceous are scant. The earliest appearance of Isurus proper seems to be during the Oligocene with Isurus desori.[10][11]

There has been much debate and speculation about the evolutionary origin and relationships between Isurus and its closest relatives, including the extant great white shark (Carcharodon carcharias). Molecular clock analyses place the last common ancestor of Isurus and Carcharodon between 43–60 million years ago during the Late Paleocene-Early Eocene.[12] This insight should guide efforts to better resolve the fossil ancestry of both lineages, by providing a window of time in which to search for ancestor candidates.

Many fossil species of Lamnids have historically been placed under Isurus, which are now largely considered separate genera. These include species of Carcharodon (Cosmopolitodus) like C. hastalis, C. planus,[13] species of Macrorhizodus,[14][15] Isurolamna,[16][17] and others.

Description

The two living species are the shortfin mako shark (I. oxyrinchus) and the longfin mako shark (I. paucus). They range in length from 2.5 to 4.5 m (8.2 to 14.8 ft),[18] and have an approximate maximum weight of 680 kg (1,500 lb).[citation needed] They both have a distinctive blue-gray color scheme common among mackerel sharks.

Species

The genus contains these species:[19]

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See also

References

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  3. ^ McEachran, J.; Fechhelm, J.D. (1998). Fishes of the Gulf of Mexico, Vol. 1: Myxiniformes to Gasterosteiformes. Fishes of the Gulf of Mexico. Austin: University of Texas Press. p. 43. Template:ISBN. Template:Catalog lookup link. Retrieved 13 July 2021.
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  6. ^ Wilson, T. and Ford, T. Biological Profiles: Longfin Mako Script error: No such module "webarchive".. Florida Museum of Natural History Ichthyology Department. Retrieved on December 25, 2008.
  7. ^ J. B. Reeside. 1955. Revised interpretation of the Cretaceous section on Vermilion Creek, Moffat County, Colorado. Wyoming Geological Association Guidebook - 1955 85–88
  8. ^ R. Zangerl and R. E. Sloan. 1960. A new specimen of Desmatochelys lowi Williston: a primitive cheloniid sea turtle from the Cretaceous of South Dakota. Fieldiana: Geology 14(2):7-40
  9. ^ Lua error in package.lua at line 80: module 'Module:Citation/CS1/Utilities' not found.
  10. ^ Andre Pharisat & Norbert Micklich (1998) Oligocene fishes in the western Paratethys of the Rhine Valley Rift System, Italian Journal of Zoology, 65:S1, 163–168, Script error: No such module "CS1 identifiers".
  11. ^ Merle, D. & Baut, J.-P. & Ginsburg, L. & Sagne, C. & Hervet, S. & Carriol, R.-P. & Venec-Peyre, T. & Blanc-Valleron, M. & Mourer-Chauviret, C. & Arambol, D. & Viette, P. (2002). Découverte d'une faune de vertébrés dans l'Oligocène inférieur de Vayres-sur-Essonne (bassin de Paris, France) : biodiversité et paléoenvironnement. Comptes Rendus Palevol, 1(2), 111–116. Script error: No such module "CS1 identifiers".
  12. ^ Martin, A. P. (1996). "Systematics of the Lamnidae and the Origination Time of Carcharodon carcharias Inferred from the Comparative Analysis of Mitochondrial DNA Sequences". In Klimley, A. P.; Ainley, D. G. (eds.). Great White Sharks: The Biology of Carcharodon carcharias. Academic Press. pp. 49–53. Script error: No such module "CS1 identifiers".. Template:ISBN
  13. ^ Ehret, D.J., Macfadden, B.J., Jones, D.S., DeVries, T.J., Foster, D.A. and Salas-Gismondi, R. (2012), Origin of the white shark Carcharodon (Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Palaeontology, 55: 1139–1153. Script error: No such module "CS1 identifiers".
  14. ^ White, E., 1956. The Eocene Fishes of Alabama. Bulletin of American Paleontology, 36 (no. 156): PRI. pp 122–152.
  15. ^ Glikman, L.S., 1964. Akuly paleogena i ikh stratigraphicheskoe znachenie. Akademii Nauk Soyuza Sovetskikh Sotsialisticheskikh Respublik, 1–228 Moscow.
  16. ^ Le Hon, H., 1871. Préliminaires d'un mémoir sur les poissons tertiaries de belgique. Brussels, pp. 1–15.
  17. ^ Leriche, M. 1905. Les poissons tertiaires de la Belgique. II. Les poissons éocènes. Mém. Mus. Roy. Hist. Natur. Belig., 11(3), p49-228.
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  20. ^ Smith, J.L.B. Sharks of the Genus Isurus Rafinesque, 1810. Ichthyological Bulletin; No. 6. Department of Ichthyology, Rhodes University, Grahamstown, South Africa
  21. ^ Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, William Collins Publishers Ltd, Auckland, New Zealand 1982 Template:ISBN

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