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A new liomerine crab of the genus Lipkemera Davie, 2010 (Decapoda, Brachyura, Xanthidae) from the Bohol Sea, central Philippines

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A new liomerine crab of the genus Lipkemera Davie, 2010 (Decapoda, Brachyura, Xanthidae) from the Bohol Sea, central Philippines
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  A NEW SPECIES OF LIPKEMERA DAVIE, 2010 (DECAPODA,BRACHYURA, XANTHIDAE, LIOMERINAE) FROM THE BOHOL SEA,PHILIPPINES BYJOSE C.E. MENDOZA 1 ) Department of Biological Sciences, Faculty of Science, National University of Singapore,14 Science Drive 4, 117543 Republic of SingaporeABSTRACTA new species of  Lipkemera Davie, 2010 (Xanthidae, Liomerinae) collected by tangle netsin the islands of Balicasag and Panglao, central Philippines, is described. Lipkemera holthuisi sp.nov.,is closely allied to  L . acutidens (Sakai, 1969),butcan bedistinguished fromitand othercongeners by the characters of its carapace, pereopods, male abdomen, male gonopods and byits live coloration. The new species is only the second species of the genus to be reported fromthe Philippines, and brings to four the total number of species known.RÉSUMÉUne nouvelle espèce de Lipkemera Davie, 2010 (Xanthidae, Liomerinae) récoltée par tanglenet dans les îles de Balicasag et de Panglao, dans les Philippines centrales est décrite.  Lipkemeraholthuisi sp.nov.estétroitementapparentéà  L.acutidens (Sakai,1969)maiss’endistingueainsique de ses autres congénères par les caractères de sa carapace, ses peréopodes, son abdomenmale, ses gonopodes males et par sa coloration sur le vivant. La nouvelle espèce est seulementla seconde espèce du genre à être trouvé aux Philippines et porte à quatre le nombre total desespèces connues. INTRODUCTIONSeveral new decapod crustacean taxa have been described from the BoholSea in the central Philippines over recent years, particularly from the vicinityof the islands of Panglao and Balicasag. This was partly a result of two marine 1 ) e-mail: jcmendoza@nus.edu.sg ©Koninklijke Brill NV, Leiden, 2010 Studies on Malacostraca: 505-513  506 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME expeditions to the area (PANGLAO 2004 & 2005) and also partly a result of earlier collections made by different parties (see Bouchet et al., 2009; Richerde Forges et al., 2009; Ng et al., 2009). One method by which these specimenswere collected was by tangle nets set in reef slopes. Ng et al. (2009) discussedin detail this particularly useful collecting method, and listed the new taxadiscovered as a result of its use; while Mendoza et al. (2010) commented onthe prevalence of rare species captured by this method.Work on these collections is by no means complete, and in this paper a newspecies of xanthid crab collected by tangle net, referrable to Lipkemera Davie,2010, is described. Davie (2010) recently established the replacement name  Lipkemera for Meriola Davie, 1993, which was a junior homonym of  Meriola Banks, 1895, a genus of spider. The discovery of this new Lipkemera speciesbrings to four the total number of species known for this genus. It is also thesecond species, after L . corallina (Takeda & Marumura, 1997), to be reportedfrom the Bohol Sea (see Takeda & Manuel, 2000).All measurements of the material examined are expressed as carapacewidth (CW) by carapace length (CL), in millimeters. The nomenclature of carapaceregionsfollowsthatofDana(1851)andSerène(1984).Thefollowingabbreviations are used: P1-P5 = first to fifth pereopods, respectively; G1 = male first gonopod; G2 = male second gonopod. The specimens in thisreport are deposited at the Crustacean Reference Collection of the NationalMuseum of the Philippines, Manila (NMCR), National Museum of NaturalHistory, Washington, D.C. (USNM) and the Zoological Reference Collectionof the Raffles Museum of Biodiversity Research, Singapore (ZRC). Theclassification proposed by Ng et al. (2008) is followed throughout this study.TAXONOMIC ACCOUNTFamily X ANTHIDAE MacLeay, 1838Subfamily L IOMERINAE Sakai, 1976Genus Lipkemera Davie, 2010 Lipkemera holthuisi sp. nov.(figs. 1-3) Material examined. — Holotype & , 21 . 8 × 13 . 5 mm (NMCR-30237, ex. ZRC 2001.0675),50-200 m, Balicasag Island, Bohol Sea, central Philippines, collected by tangle net fishermen,purchased by P.K.L. Ng, December 2001. Paratypes, 2 & , 10 . 0 × 6 . 9 mm, 14 . 1 × 9 . 5 mm, 1 % ,  Mendoza, NEW LIPKEMERA FROM THE PHILIPPINES 507 24 . 3 × 16 . 0 mm (ZRC 2009.1171), 50-200 m, off northern coast of Panglao Island, Bohol Sea,central Philippines, collected by tangle net by J. Arbasto, between April 2004 & May 2005.Comparative material. — Lipkemera acutidens (Sakai, 1969), holotype & , 41 . 5 × 23 . 8 mm(USNM 125874), 30-50 m, Shimogusui, Wakayama Prefecture, Honshu Island, Japan, coll. byH. Hayashi (no collection date). Description. — Carapace (figs. 1A, 2A) 1.5-1.6 times broader than long,anterior half with regions well defined, granular, posterior half with regionsindistinct, smooth; 2M partially divided longitudinally, inner branch narrower,fused with 1M, which is separated by groove from 2F, outer branch wider; 3Mwell defined; other regions indistinct; grooves bordering 2M and 3M, deep,smooth. Front about 0.3 times carapace width, bilobed, not exceeding level of internal orbital angle; each lobe with laterally positioned concavity on anteriormargin, lateral angles produced; lobes separated by shallow cleft, which con-tinues as median sulcus on frontal region. Supraorbital region raised; supraor-bital margin granular. Orbits small, width about 0.1 times carapace width. Sub-orbital and subhepatic regions granular. Anterolateral marginregularly convex,divided into 4 teeth, anterior 2 of which are low, almost indistinct lobes, pos-terior 2 low, triangular teeth; apices of 2 posterior teeth at point of maximumcarapace width. Distinct grooves between second and third teeth, third andfourth teeth, extending into branchial region dorsally. Posterolateral marginstraight, convergent posteriorly. Posterior carapace margin raised, central partstraight.Eyes with short eyestalks, distal edge with cornea lined with small, conicalgranules; corneas well developed (fig. 1C). Antennules (figs. 1C, 2B) fold-ing transversely; inter-antennular septum narrow. Basal antennal segment sub-quadrate, granular, occupying entire space between antennular fossa, internalorbital angle, filling orbital hiatus; flagellum arising from distal margin, reach-ing just beyond outer edge of orbit. Posterior margin of epistome with me-dian projection and deep notches laterally. Merus of third maxillipeds (fig. 2B)granular, much wider than long, median length 0.4 times that of ischium; ante-rior, mesial and lateral margins straight, anteroexternal angle rounded, slightlyproduced. Ischium smoother than merus, subrectangular, inner margin withshort,stiffsetae;withshallow,longitudinalsub-mediangroove;separatedfrombasis by feeble suture. Exopod tapering toward distal end, almost reachinglevel of anterior margin of merus; flagellum long.Surface of thoracic sternum (fig. 1B) with low granules, anterior regionbroad. Sternites 1, 2 completely fused into triangular plate, anterior portionnarrow and extending well between ischia of third maxillipeds, separated fromsternite 3 by distinct transverse suture. Sternites 3, 4 partially fused, with  508 CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME Fig. 1. Lipkemera holthuisi sp. nov., holotype male, 21 . 8 × 13 . 5 mm (NMCR-30237); A, dorsalview; B, ventral view; C, frontal view.  Mendoza, NEW LIPKEMERA FROM THE PHILIPPINES 509 Fig. 2. Lipkemera holthuisi sp. nov., holotype male, 21 . 8 × 13 . 5 mm (NMCR-30237); A, close-up of carapace, dorsal view; B, buccal field, ventral view; C, left chela, external view; D, leftambulatory legs (P4-P5), dorsal view. incomplete sutures laterally; sternite 4 with shallow median depression justanterior to sterno-abdominal cavity. Sterno-abdominal cavity deep, anteriorlyreaching to imaginary line joining midpoint of cheliped coxae, press button of male abdominal locking mechanism on sternite 5, near suture with sternite 4.Chelipeds (P1) (fig. 1A) symmetric. Merus granular on external surface,distal end just exceeding anterolateral margin of carapace in dorsal view.Carpus as long as merus; dorsal, ventral surface granular, inner marginextended into 2 blunt teeth. External surface of palm (fig. 2C) of bothchelaegranular;innersurfacerelativelysmoother;uppermarginstraight,lowermargin slightly convex, with slight concavity at base of fixed finger. Fingerspigmented, with pigmentation on fixed finger extending onto external andinternal surface of palm; tips spooned, pale. Fixed finger slightly deflexed,with groove on external surface, cutting margin with 2 large, triangular teethin the center and 2 much smaller teeth near either end. Dactylus longer thanupper margin of palm, slightly curved, external surface with 2 grooves, cuttingmargin with 1 well developed, rounded tooth proximally, 1 or 2 much smallerteeth distally.
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