PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 114(2):444-483. 200 L Revision of Pylopagurus and Tomopagurus (Crustacea: Decapoda: Paguridae), with descriptions of new genera and species. Part VI. Pylopagurus A. Milne-Edwards & Bouvier, 1891, Haigia McLaughlin, 1981, and Pylopaguridium, a new genus Patsy A. McLaughlin and Rafael Lemaitre (PMcL) Shannon Point Marine Center, Western Washington University, 1900 Shannon Point Road, Anacortes, Washington 98221-9081B, U.SA., e-mail:
[email protected]; (RL) Department of Systematic Biology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560-0163, U.SA., e-mail:
[email protected] Abstract. — In this final part of a six-part series, two new species of Pylo-pagurus A. Milne-Edwards & Bouvier are described, P. macgeorgei and P. gorei, and one existing species, P. longicarpus Walton, is placed in synonymy with P. holmesi Schmitt. Some species of Pylopagurus have been found to exhibit weak development of a male sexual tube, thus requiring emendation of the generic diagnosis. A new monotypic genus, Pylopaguridium, is proposed for a new species, P. markhami, in which males have asymmetrical coxae of the fifth pereopods. The monotypic Pacific genus Haigia McLaughlin, is re-viewed. An amended key to all the genera of the " Pylopagurus-Tomopagurus'' group, and a key to the species now assigned to Pylopagurus are included. All species of Pylopagurus, Pylopaguridium, and Haigia are diagnosed or de-scribed and illustrated, and their morphological variations discussed. As pointed out by McLaughlin (1981a), the principal characters uniting the genera Pylopagurus A. Milne-Edwards & Bouvier, 1891 and Tomopagurus A. Milne-Edwards & Bouvier, 1893, presumably were the presence of 1 1 pairs of biserial gills (cf. McLaughlin & de Saint Laurent 1998), the occurrence of paired first female pleopods modified as gonopods, and the absence of secondary sexual modifications in males. In her initial revision of the '' Pylopagurus-To-mopagurus'' group, McLaughlin (1981a) subdivided Pylopagurus sensu lato into 1 1 genera, and redefined Tomopagurus to in-clude species in which female gonopods might not develop. Subsequently, Lemaitre & McLaughlin (1996) described and added another genus, Protoniopagurus Lemaitre & McLaughlin, 1996, to the group. In this concluding study of Pylopagurus sensu stricto, we have found it necessary to adjust our concept of the genus again as the result of the observations of slight sexual tube de-velopment in some species and in related "Pylopagurus-Tomopagurus'" group gen-era. It would appear that these genera bridge phylogenetic gaps between those genera with highly specialized male sec-ondary sexual adaptations, other genera in which females develop modified paired first pleopods, and those more simplistic genera such as the heterogeneous genus Pagurus Fabricius, 1775. Specimens included in part VI have come from the Allan Hancock Foundation, University of Southern California, now part of the collections of the Natural History Museum of Los Angeles County (LACM CR); Dauphin Island Sea Lab, University of Alabama (DISL); Florida Department of Natural Resources, St. Petersburg (DNR); Florida International University, Miami (FIU); Instituto de Ciencias Naturales, Mu-seo de Historia Natural, Universidad Na-
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