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(Decapoda, Paguridae), and a New Record for Nematopagurus Alcocki Mclaughlin, 1997

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(Decapoda, Paguridae), and a New Record for Nematopagurus Alcocki Mclaughlin, 1997 A NEW AND DISTINCTIVE JAPANESE SPECIES OF NEMATOPAGURUS (DECAPODA, PAGURIDAE), AND A NEW RECORD FOR NEMATOPAGURUS ALCOCKI MCLAUGHLIN, 1997 BY PATSY A. MCLAUGHLIN1,3) and JUNJI OKUNO2,4) 1) Shannon Point Marine Center, Western Washington University, 1900 Shannon Point Road, Anacortes, WA 98221-4042, U.S.A. 2) Coastal Branch of Natural History Museum and Institute, Chiba, 123 Yoshio, Katsuura, Chiba, 299-5242, Japan ABSTRACT Nematopagurus lipkei, a new species of the hermit crab genus Nematopagurus, is described from the Japanese Ryukyu Islands. The new species is compared with its closest congeners and its very distinctive attributes emphasized. Additionally, the distributional range of a second species of the genus, N. alcocki, is documented and its living color is described for the first time. RÉSUMÉ Nematopagurus lipkei, une espèce nouvelle de bernard-l’ermite du genre Nematopagurus, est décrite à partir d’un matériel en provenance des îles japonaises Ryukyu. La nouvelle espèce est comparée avec les espèces les plus proches du même genre, et ses caractères hautement distinctifs sont soulignés. En outre, l’aire de distribution d’une seconde espèce du même genre, N. alcocki, est documentée, et la coloration des animaux vivants est décrite pour la première fois. INTRODUCTION Hermit crabs of the genus Nematopagurus A. Milne-Edwards & Bouvier, 1892 inhabit sublittoral to deep waters primarily of the Indian and Pacific Oceans, with only one species known from the Atlantic. McLaughlin (2004) reviewed the genus and reported 25 species from the Indo-Pacific region. These 3) e-mail: hermit@fidalgo.net 4) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2010 Studies on Malacostraca: 473-482 474 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME representatives of the genus are distributed from the east coast of South Africa in the west to the Hawaiian Islands and French Polynesia in the east and from Japan in the north to Tasmania in the south, some with very broad distributional ranges and others seemingly endemic to restricted locales. In 2003, a field guide to decapod crustaceans found at Kume-jima Island, one of Japan’s Ryukyu Islands, was published in which an unfamiliar hermit crab species was reported only as Paguridae sp. (Kawamoto & Okuno, 2003). Although its voucher specimen was collected, its generic position could not be determined at that time because the species was represented by a single female specimen. Subsequently, a male and an ovigerous female of same species were captured in a submarine cave in Okinawa-jima Island, one of the Ryukyu Islands. Our examination found that Kawamoto and Okuno’s (2003) Paguridae sp. represented an undescribed species of Nematopagurus,whichis now described as Nematopagurus lipkei sp. nov. Additionally, a single male specimen referable to Nematopagurus alcocki McLaughlin, 1997 recently was collected from Suruga Bay, on the Pacific coast of central Japan. This is the first record of N. alcocki in Japanese waters, and its coloration in life is described for the first time herein. MATERIAL AND METHODS The specimens all were captured by using SCUBA gear, and have been deposited at the Coastal Branch of Natural History Museum and Institute, Chiba (CMNH). Terminology for the description follows that of McLaughlin (2004). One measurement, shield length, given in parentheses following the specimen sex, provides an indication of animal size. The abbreviation coll. refers to collector. SYSTEMATICS Family PAGURIDAE Latreille, 1802 Nematopagurus A. Milne-Edwards & Bouvier, 1892 Nematopagurus lipkei sp. nov. (figs. 1, 2) Paguridae sp. — Kawamoto & Okuno, 2003: 92, 1 unnumbered fig. Material examined. — Holotype CMNH-ZC 02301, male (3.2 mm), submarine cave at Zanpa-misaki, Okinawa Island, Japan, 38 m, 3 March 2007, coll. K. Kamiya. Paratypes:.
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