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A New Species of the Squat Lobster Genus Munida (Decapoda: Anomura: Munididae) from the North Pacific off Japan

During a 2009 research cruise of the RV Soyomaru of the National Research Institute of Fisheries Science, Fisheries Research Agency, the bathyal to abyssal slope on the Iwaki Seamount, located nearly to the Japan Trench, east of Fukushima Prefecture, was sampled using a small beam trawl (� benthos net). This data presents the first records of the marine fauna of this seamount. Among the small collection of decapod crustaceans, two specimens of galatheid lobsters were found. Detailed examination has revealed that these specimens represent an undescribed species of Munida Leach, 1820. In this study, this new species is described and illustrated under the name M. ampliantennulata. It appears closest to M. magniantennulata Baba and Turkay, 1992 known from the Lau Basin and off Queensland, Australia, and M. subcaeca Bouvier, 1922 from the Atlantic, both known from depths greater than 1000 m. Differentiating characters between the new species and the two relatives are discussed. The type specimens are deposited in the Natural History Museum and Institute, Chiba (CBM) and the National Museum of Nature and Science, Tokyo (NSMT). The measurement provided is postrostral carapace length (CL), measured in millimeters from the base of the rostral spine to the midpoint of the posterior margin of the carapace. Higher classification follows that recently proposed by Ahyong et al. (2010)