DecaNet (World List of Decapoda)

Osawa, M. (2015). A new species of Polyonyx Stimpson, 1858 (Crustacea: Decapoda: Anomura: Porcellanidae) from the PANGLAO 2004 Marine Biodiversity Project in the Philippines. Raffles Bulletin of Zoology. 63: 536-545.

222248

urn:lsid:zoobank.org:pub:E910F6E7-46AB-43C3-928F-633642E91C3F [view]

Osawa, M.

2015

63: 536-545

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A new porcellanid crab from the Philippines, Polyonyx similis, is described from material collected through the PANGLAO 2004 Marine Biodiversity Project in the Philippines. The new species is morphologically allied to P. biunguiculatus (Dana, 1852) and has been confused with the latter species in previous studies. However, Polyonyx similis, new species, can be distinguished from P. biunguiculatus by the shape of the rostrum, the palm of the cheliped bearing flattened tubercles on the distal dorso-anterior surface, and the lack of male gonopods. The size-related changes of armatures on the carapace and appendages in the new species are provided. Of interest is that young specimens of P. similis have spines on the lateral margins of the carapace, the armature is known as a character of the genus Aliaporcellana Nakasone & Miyake, 1969 rather than Polyonyx Stimpson, 1858. Although the close relationship between the species of the P. biunguiculatus group and Aliaporcellana are suggested, the Polyonyx species group is still distinguishable from the latter genus by the blunt outer orbital angle, the unarmed third article of the antennal peduncle, and the usually elongate carpus of the cheliped.

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