Monday, September 17, 2012

[Crustacea • 2011] Gopkittisak angustus • A New Species of the Varunid Crab Genus Gopkittisak (Crustacea: Decapoda: Brachyura: Grapsoidea) from the Ryukyu Islands, Japan


Gopkittisak angustus Komai 2011

A new species of the varunid crab genus Gopkittisak Naruse and Clark, 2009, G. angustum sp. nov., is described on the basis of seven specimens from intertidal sand flats at Iriomote Island, Ryukyu Islands, Japan. It is close to its sole congener G. gallardoi (Serène and Soh, 1976), but the different shapes of the carapace and male abdomen, as well as the setal pattern of the propodus of the fourth pereopod and the coloration in life, distinguish the new taxon from G. gallardoi.

Key Words: Crustacea, Decapoda, Brachyura, Varunidae, Gopkittisak, new species, Japan.


Etymology. From the Latin angustus ( narrow), in reference to the relatively narrow carapace compared with the sole congeneric species, G. gallardoi.

Coloration in life. Carapace generally gray or beige, with scattered brown dots; chelipeds and ambulatory legs generally gray (Naruse and Clark 2009, fig. 3b).
Distribution. Known only from Iriomote Island, Yaeyama Islands, Ryukyus, and Panglao Island, Philippines; intertidal sand flats.


A New Species of the Varunid Crab Genus Gopkittisak (Crustacea: Decapoda: Brachyura: Grapsoidea) from the Ryukyu Islands

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