Shortspine spurdog

The shortspine spurdog (Squalus mitsukurii) is a dogfish, a member of the family Squalidae, found on continental shelves off Japan in temperate waters, from the surface to 950 m. Its length is up to 75 cm.^[2]

Shortspine spurdog
Conservation status
Endangered  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Division:	Selachii
Order:	Squaliformes
Family:	Squalidae
Genus:	Squalus
Species:	S. mitsukurii
Binomial name
Squalus mitsukurii D. S. Jordan & Snyder, 1903
Range of the shortspine spurdog
Synonyms
Squalus acutirostris Chu, Meng & Li, 1984

Taxonomy

The shortspine dogfish was once seen as a circumglobal species by many authors, including Compagno (1984) and Last & Stevens (1994).^[3][4] However, a series on papers published since 2007 have shown that a number of species synonymized with S. mitsukurii are distinct, and that the Hawaiian population of S. mitsukurii represent a distinct species, the Hawaiian spurdog.^[5][6][7]

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  Head
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  Jaws
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  Upper teeth
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  Lower teeth