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Grapsus grapsus (Linnaeus).
Cancer grapsus Linnaeus, Syst. Naturae, ed. 12, p. 1048. 1766.
Grapsus pictus Miers, Cat. Crust. N.Z., p. 36. 1876.
Grapsus pictus Filhol, Mission de l'Ile Campbell, p. 387. 1885.
Grapsus maculatus Whitelegge, Mem. Austr. Mus., 3, 2, p. 139. 1897.
Grapsus grapsus Borradaile, Proc. Zool. Soc., p. 592. 1900.
— Rathbun, Proc. Acad. Sci. Washington, vol. 4, p. 278. 1902.
— Rathbun, Proc. U.S. Nat. Mus., vol. 38, pp. 547, 588. 1910.
— Lenz and Strunck, Deutsche Sudpolar Exped., Bd. 15, h. 3, p. 183. 1914.
— Rathbun, U.S. Nat. Mus. Bulletin No. 97, p. 227, Fig. 135. 1917.
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Although this crab has an enormous distribution, and may very well occur in New Zealand, it is not typically a South West Pacific species. The records are not entirely convincing, and Hutton has proposed to exclude the species from the list; but it is included in the Index. There is a specimen from Kapiti Island in the Wanganui Museum labelled Grapsus pictus, but it is Leptograpsus variegatus.
Locality.—N.Z. (Miers).
Auckland Harbour (Filhol).
Distribution.—Tropical Indo-Pacific and Atlantic regions, abundant; the distribution is quite circumtropical (Ortmann).