Abstract
A new species of deep-water oregoniid spider crab of the genus Pleistacantha Miers, 1879, is described from the Indian Ocean. The species is distinct in possessing a prominently inflated carapace in which the median parts of the branchial regions almost meet. It can also be distinguished from its closest congeners, P. moseleyi (Miers, 1885), P. pungens (Wood-Mason, in Wood-Mason & Alcock, 1891), and P. ori Ahyong & Ng, 2007, in its more elongate and less spinose chelipeds and ambulatory legs, shorter third maxilliped, trapezoidal male pleon and a male first gonopod which is relatively stout with a short subdistal dorsal papilla.
Highlights
The majoid genus Pleistacantha Miers, 1879, currently contains 12 species (Ahyong and Lee 2006; Ahyong and Ng 2007; Ng et al 2008)
It can also be distinguished from its closest congeners
a male first gonopod which is relatively stout with a short subdistal dorsal papilla
Summary
The majoid genus Pleistacantha Miers, 1879, currently contains 12 species (Ahyong and Lee 2006; Ahyong and Ng 2007; Ng et al 2008). Pleistacantha ori Ahyong & Ng, 2007: holotype male (cl 146.0 mm, pcl 129.1 mm, cw 106.3 mm) (ZRC 2006.158), off Durban, South Africa, coll.
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