Isurus

Isurus; Temporal range:Early Oligocene- recent PreꞒ Ꞓ O S D C P T J K Pg N
	Shortfin mako shark(I. oxyrinchus)
	Longfin mako shark(I. paucus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Subdivision:	Selachimorpha
Order:	Lamniformes
Family:	Lamnidae
Genus:	Isurus; Rafinesque,1810
Type species
	Isurus oxyrinchus; Rafinesque, 1810
Synonyms
	IsuropsisGill, 1862; LamiostomaGlikman, 1964; OxyrhinaAgassiz, 1838; OxyrrhinaBonaparte, 1846; PlectrostomaGistel, 1848;

Isurus(meaning "equal tail" )^[1]is agenusofmackerel sharksin the familyLamnidae,commonly known as themako sharks.They are largely pelagic,^[2]and are fast, predatory fish capable of swimming at speeds of up to 50 km/h (31 mph).^[3]^[4]

Fossil history and evolution

Although fossil teeth ofIsurushave been reported from as early as theLate Cretaceous,^[5]^[6]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) genusOxyrhina,^[7]and modern referrals toIsurusin the Cretaceous are scant. The earliest appearance ofIsurusproper seems to be during theOligocenewithIsurus desori.^[8]^[9]

There has been much debate and speculation about the evolutionary origin and relationships betweenIsurusand its closest relatives, including the extantgreat white shark(Carcharodon carcharias).Molecular clock analysesplace the last common ancestor ofIsurusandCarcharodonbetween 43-60 million years ago during the Late Paleocene-Early Eocene.^[10]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 ofLamnidshave historically been placed underIsurus,which are now largely considered separate genera. These include species ofCarcharodon(Cosmopolitodus) likeC. hastalis, C. planus,^[11]species ofMacrorhizodus,^[12]^[13]Isurolamna,^[14]^[15]and others.

Description

The two living species are theshortfin mako shark(I. oxyrinchus) and thelongfin mako shark(I. paucus). They range in length from 2.5 to 4.5 m (8.2 to 14.8 ft)^{[citation needed]},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:^[16]

Isurus oxyrinchus(Rafinesque,1810)(shortfin mako shark)^[17]
Isurus paucus(Guitart-Manday,1966)(longfin mako shark)^[18]
†Isurus desori(Agassiz,1843)
†Isurus retroflexus(Agassiz,1843)

References

^"Isurus paucus".Discover Fishes.Retrieved2023-05-24.
^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.ISBN 978-0-292-75206-1.OCLC 38468784.Retrieved 13 July 2021.
^Peter Klimley, A.; Beavers, Sallie C.; Curtis, Tobey H.; Jorgensen, Salvador J. (2002)."Movements and Swimming Behavior of Three Species of Sharks in La Jolla Canyon, California".Environmental Biology of Fishes.63(2): 117–135.doi:10.1023/A:1014200301213.S2CID 27883104.
^"Shortfin Mako Shark".ocean.si.edu.May 23, 2023.RetrievedMay 23,2023.
^J. B. Reeside. 1955. Revised interpretation of the Cretaceous section on Vermilion Creek, Moffat County, Colorado.Wyoming Geological Association Guidebook - 195585-88
^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: Geology14(2):7-40
^Agassiz, Louis (1833).Recherches sur les poissons fossiles...Neuchatel: Petitpierre.doi:10.5962/bhl.title.4275.
^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,doi:10.1080/11250009809386808
^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.doi:10.1016/S1631-0683(02)00018-0
^Martin, A. P. (1996). "Systematics of the Lamnidae and the Origination Time ofCarcharodon carchariasInferred 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.doi:10.1016/B978-0-12-415031-7.X5000-9.ISBN 978-0-12-415031-7
^Ehret, D.J., Macfadden, B.J., Jones, D.S., DeVries, T.J., Foster, D.A. and Salas-Gismondi, R. (2012), Origin of the white sharkCarcharodon(Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Palaeontology, 55: 1139-1153.doi:10.1111/j.1475-4983.2012.01201.x
^White, E., 1956. The Eocene Fishes of Alabama.Bulletin of American Paleontology,36 (no. 156): PRI. pp 122-152.
^Glikman, L.S., 1964. Akuly paleogena i ikh stratigraphicheskoe znachenie. Akademii Nauk Soyuza Sovetskikh Sotsialisticheskikh Respublik, 1-228 Moscow.
^Le Hon, H., 1871.Préliminaires d'un mémoir sur les poissons tertiaries de belgique.Brussels, pp. 1-15.
^Leriche, M. 1905. Les poissons tertiaires de la Belgique. II. Les poissons éocènes.Mém. Mus. Roy. Hist. Natur. Belig.,11(3), p49-228.
^"Fossilworks".Archived fromthe originalon 2022-10-31.Retrieved2021-12-17.
^Smith, J.L.B.Sharks of the Genus Isurus Rafinesque, 1810.Ichthyological Bulletin; No. 6. Department of Ichthyology, Rhodes University, Grahamstown, South Africa
^Tony Ayling & Geoffrey Cox,Collins Guide to the Sea Fishes of New Zealand,William Collins Publishers Ltd, Auckland, New Zealand 1982ISBN 0-00-216987-8

[1] "Isurus paucus".Discover Fishes.Retrieved2023-05-24.

[2] 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.ISBN 978-0-292-75206-1.OCLC 38468784.Retrieved 13 July 2021.

[3] Peter Klimley, A.; Beavers, Sallie C.; Curtis, Tobey H.; Jorgensen, Salvador J. (2002)."Movements and Swimming Behavior of Three Species of Sharks in La Jolla Canyon, California".Environmental Biology of Fishes.63(2): 117–135.doi:10.1023/A:1014200301213.S2CID 27883104.

[4] "Shortfin Mako Shark".ocean.si.edu.May 23, 2023.RetrievedMay 23,2023.

[5] J. B. Reeside. 1955. Revised interpretation of the Cretaceous section on Vermilion Creek, Moffat County, Colorado.Wyoming Geological Association Guidebook - 195585-88

[6] 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: Geology14(2):7-40

[7] Agassiz, Louis (1833).Recherches sur les poissons fossiles...Neuchatel: Petitpierre.doi:10.5962/bhl.title.4275.

[8] 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,doi:10.1080/11250009809386808

[9] 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.doi:10.1016/S1631-0683(02)00018-0

[10] Martin, A. P. (1996). "Systematics of the Lamnidae and the Origination Time ofCarcharodon carchariasInferred 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.doi:10.1016/B978-0-12-415031-7.X5000-9.ISBN 978-0-12-415031-7

[11] Ehret, D.J., Macfadden, B.J., Jones, D.S., DeVries, T.J., Foster, D.A. and Salas-Gismondi, R. (2012), Origin of the white sharkCarcharodon(Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Palaeontology, 55: 1139-1153.doi:10.1111/j.1475-4983.2012.01201.x

[12] White, E., 1956. The Eocene Fishes of Alabama.Bulletin of American Paleontology,36 (no. 156): PRI. pp 122-152.

[13] Glikman, L.S., 1964. Akuly paleogena i ikh stratigraphicheskoe znachenie. Akademii Nauk Soyuza Sovetskikh Sotsialisticheskikh Respublik, 1-228 Moscow.

[14] Le Hon, H., 1871.Préliminaires d'un mémoir sur les poissons tertiaries de belgique.Brussels, pp. 1-15.

[15] Leriche, M. 1905. Les poissons tertiaires de la Belgique. II. Les poissons éocènes.Mém. Mus. Roy. Hist. Natur. Belig.,11(3), p49-228.

[AA-16] "Fossilworks".Archived fromthe originalon 2022-10-31.Retrieved2021-12-17.

[17] Smith, J.L.B.Sharks of the Genus Isurus Rafinesque, 1810.Ichthyological Bulletin; No. 6. Department of Ichthyology, Rhodes University, Grahamstown, South Africa

[18] Tony Ayling & Geoffrey Cox,Collins Guide to the Sea Fishes of New Zealand,William Collins Publishers Ltd, Auckland, New Zealand 1982ISBN 0-00-216987-8

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Fossil history and evolution

Description

Species

See also

References