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Periclimenes Vanellus Spec. Nov., a New Sponge-Associated Pontoniine Shrimp (Decapoda, Caridea, Palaemonidae) from Indonesia

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Periclimenes Vanellus Spec. Nov., a New Sponge-Associated Pontoniine Shrimp (Decapoda, Caridea, Palaemonidae) from Indonesia PERICLIMENES VANELLUS SPEC. NOV., A NEW SPONGE-ASSOCIATED PONTONIINE SHRIMP (DECAPODA, CARIDEA, PALAEMONIDAE) FROM INDONESIA BY CHARLES H.J.M. FRANSEN1) NCB — Naturalis, P.O. Box 9517, 2300 RA Leiden, The Netherlands ABSTRACT A new sponge-associated species of the genus Periclimenes is described from Halmahera, Indonesia. The new species has some affinities with species from the Periclimenes iridescens and Periclimenes obscurus species complexes as well as with Phycomenes indicus (Kemp, 1915), but can easily be separated from these species by the very long upper antennular flagellum and antennal flagellum, and the distinctly spatulate second pereiopods. RÉSUMÉ Une nouvelle espèce du genre Periclimenes, vivant en association avec des éponges, est décrite à partir d’échantillons récoltés à Halmahera en Indonésie. Cette nouvelle espèce a des affinités avec les complexes d’espèces Periclimenes iridescens et Periclimenes obscurus ainsi qu’avec Phycomenes indicus (Kemp, 1915), mais peut facilement s’en distinguer par son très longue flagelle antennulaire supérieure son flagelle antennaire, et ses deuxièmes péréiopodes spatulés. INTRODUCTION The pontoniine genus Periclimenes Costa, 1844 at present contains 173 named species (De Grave et al., 2009) of which 152 are known from the Indo- Pacific. Except for a few free-living species, most members of the genus live in association with other invertebrates. Six sponge-associated Periclimenes species have thus far been recorded from the Indo-Pacific: P. burrup Bruce, 2007b, P. forcipulatus Bruce, 1991; P. incertus Borradaile, 1915; P. obscurus Kemp, 1922 (see Bruce, 2007a), P. rex Kemp, 1922, and P. ? zevinae Duris, 1990 (see Fransen, 1994). 1) e-mail: [email protected] © Koninklijke Brill NV, Leiden, 2010 Studies on Malacostraca: 241-253 242 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME A faunal survey for shallow-water pontoniine shrimps during a research ex- pedition to Ternate and surroundings, organized by the National Museum of Natural History Naturalis in Leiden, the Netherlands, as part of the Ekspedisi Widya Nusantara (E-Win expedition) of the Research Center for Oceanogra- phy, Indonesian Institute of Sciences (RCO-LIPI) on Java, Indonesia, revealed the existence of a largely translucent species of Periclimenes not yet known to science, associated with the verongid sponge Ianthella basta (Pallas, 1766). Specimens were caught in a plastic bag which was pulled over the surface of the foliaceus sponge. The species is herein described and illustrated. Type material is deposited in the National Museum of Natural History, Leiden, the Netherlands. Abbreviations: pocl., postorbital carapace length; RMNH, Rijksmuseum van Natuurlijke Historie [now National Museum of Natural History], Leiden, the Netherlands. TAXONOMY Family PALAEMONIDAE Rafinesque, 1815 Subfamily PONTONIINAE Kingsley, 1878 Periclimenes Costa, 1844 Periclimenes vanellus sp. nov. (figs. 1-6) Material examined. — Male holotype, pocl. 2.3 mm, RMNH D 53181; Indonesia, off ◦ ◦ Halmahera mainland, Teluk Dodinga, Karang Galiasa Besar E, 0 50 45.6 N 127 35 7.4 E, on Ianthella basta, depth 15 m, 14.xi.2009, collected by C.H.J.M. Fransen, stn. TER.38. Paratypes, 7 males, 2 females, pocl. 1.8-2.2 mm, RMNH D 53182; same data as holotype. Description. — Rostrum (fig. 1A, B) slightly directed upward, deep-bladed, short, not reaching beyond distal end of first antennular segment, dorsally armed with 6-7 teeth, posterior-most tooth at level of hepatic spine, epigastric, widely separated from remainder of series, second tooth in dorsal series anterior to orbit; ventral margin unarmed, proximally convex, setose. Carapace (fig. 1A, 2A) subcylindrical, with hepatic spine well developed, acute, at level of antennal spine, more robust than antennal spine; antennal spine marginal, acute; inferior orbital angle produced, rounded; anterolateral angle rounded. Pleura of abdominal somites 1-5 (fig. 1C) rounded; abdominal somite 6 twice as long as somite 5. Telson (fig. 2B) 2/3 of length of sixth abdominal somite, with two pairs of dorsal spines, 0.06 of telson length, anterior pair at 0.53 of telson length,.
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