Abstract
McLaughlin & Haig (1984) divided the genus Pagurixus Melin, 1939 in two informal species groups on the basis of the presence or absence of setal row(s) on the ventral surface of the ultimate segment of the antennular peduncle. The first group, characterized by the presence of the setal rows, is herein named the P. boninensis species group, and the second, characterized by the absence of setal rows, is named the P. anceps group. In this paper, species of the P. boninensis group are reviewed. Thirteen species are recognized in this species group, of which six are new: Pagurixus laevimanus (Ortmann, 1892), P. maorus (Nobili, 1906), P. boninensis (Melin, 1939), P. tweediei (Forest, 1956), P. festinus McLaughlin & Haig, 1984, P. nomurai Komai & Asakura, 1995, P. pulcher Osawa, Fujita & Okuno, 2006, P. brachydactylus n. sp. , P. carinimanus n. sp. , P. concolor n. sp. , P. paulayi n. sp. , P. pseliophorus n. sp. and P. ruber n. sp. These species are further arranged into two subgroups based on the presence or absence of a lateral ridge on the carpus of the left cheliped. The new species are fully described and illustrated. Redescriptions or updated descriptions and illustrations are given for each previously described species in order to facilitate comparisons. The affinities and important morphological variations of the species are discussed and their overall distributions are updated. Because of the sexual dimorphism exhibited by species of this genus, separate identification keys to males and females are presented.
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