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O Ntwo Species Ofmangrove Leucosiidae from Irian Jaya

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O Ntwo Species Ofmangrove Leucosiidae from Irian Jaya CRUSTACEAN RESEARCH，NO. 32: 1-1 2，2003 Ontwo species ofmangrove Leucosiidae from Irian Jaya，Indonesia ， with notes onPhilyr αmalザαctrix (Kemp，1915) (Decapoda:Brachyura) Dwi Listyo Rahayu and PeterK. L. Ng Abstract. -Two species of leucosiid lems with the taxonomy of P. malefactrix crabs，Philyr αnishihirαiTakeda & were identified. As aresult ，the taxonomy of Nakasone，1991 ，and P. bicornis，new P. mal抑 ctrix is revised on the basis of the species，are reported from mangroves types and fresh specimens，and P. minuta near the mouth of Kamora River in the Chen & Turkay，2001 ，is synonymised with southeast coast of Irian Jaya， Indonesia. Philyrαnishihirαiis record- The genus Philyra Leach，1817 (type ed for the first time since its original species Leucosia globus Fabricius，1775 ，des- description. Philyrα， bicornis resembles ignation by H. Milne Edwards，1837) is one P.mαt ザαctrix (Kemp，1915) but dif- of the largest in the Leucosiidae，with 43 fers in that the posterolateral angle of recognised species (P. K. L. Ng，unpub- the carapace is strongly projected and li shed compiled data). 百le characters sepa- the male first pleopod is long，straight rating Philyra from the closely allied Ebalia and tapering at the tip. The taxonomy Leach，1817 ，are not always reliabl e，and the of Philyra malザαctrix (Kemp，1915) is generic status of many species in these also discussed，and Philyrαminutα genera are still unclear (see Takeda & Chen & Turkay，2001 ，is here syn・ Nakasone，1991; Tan，1995; Chen & Turkay， onymised with P. m αt ザαctrix. 2001; P. K. L. Ng，unpublished data). Nevertheless，species that have awell devel- oped subhepatic facet and the epistome visi- Introduction ble from the dorsal view are currently placed Despite the hi gh diversity of leucosiid in Philyra rather than Ebalia (see Chen & crabs in the Indo-West Pacific ，there are few Turkay，2001: 254) . records of them from mangroves. Thus far ， The abbreviations G1 and G2 are used only the following species haveb een report- for the male first and second pleopods ed from mangroves or associated habitats: respectively. Measurements provided are of Philyra malefactrix (Kemp，1915) ，P. taekoae the carapace width and length respectively. Takeda，1972 ，P. iriomotensis Sakai，1983 ，P. Specimens examined are deposited in the nishihirai Takeda & Nakasone，1991 ，P. min- Research Center for Oceanography (RCO) ， utαC， h e n & Turkay，2001 ，and Praosia punc- Indonesian In stit ute of Sciences，Jakarta ， tata Tan & Ng，1993. In this paper，we Indonesia; Museum Zoologicum Bogoriense describe anew species，Phi かra bicornis ， (MZB)，Cibinong ，Indonesia ;The Natural from mangroves in the southwest coast of History Museum (ex British Museum of Iri an Jaya，Indonesia ，as well as substantially Natural History，BMNH) ，London; and extend the range of P.nishihirai. As Philyra Zoological Reference Collection (ZRC) of bicornis is close to P. malefactrix (Kemp， the Raffles Museum，National University of 1915) ，compariso ns were made with this Singapore. species，and in the process，severa lprob- 2 D. L. RAHAYU & P. K. L. Ng grove near river mouth，Ka mora，lrian Jaya， Taxonomy Indonesia，col l. A. Pratiwi ，29 June 2001; 2 ovigerous females (7 .4 by 6.5 mm，7.4 by 6.6 Philyrαnis hihirαiTakeda & Nakasone ， mm) (RCO) ，1 ovigerous fema1e (7.0 by 6.5 1991 mm) (MZB)，1 fema 1e (5 .5by 4.6 mm) (Figs. 1a，2， 3) (ZRC) ，sandy-mud substrate in mangrove PhilyrαnishihirαiTakeda & Nakasone ， near river mouth，Kamora ，Irian Jaya， 1991: 21 ，Fig. 2. Indonesia，co11. A. Pratiwi ，10 July 2001; 1 male (5.5 by 5.1 mm) (RCO)，sandy-mud Materia1examined. -1 ma1e(6.0 by 5.4 substrate in mangrove near river mouth， mm) (RCO) ，sandy-mud substrate in man- Kamora，Irian Jaya ，Indonesia ，col 1. A. Fig. 1. a，Philyra nishihirai Takeda & Nakasone，199 1. a. male (6.3 by 5.9 mm) (ZRC) ，b. Phi かra bicor- nis ，new species ，male holotype (7.1 by 6.5 mm) (MZB). MANGROVE LEUCOSIIDAE OF IRIAN JAYA 3 {i' 、子恐 ." 円「 ヨ グF q. "'Y 町1' ， 、.ラ，. 噌ヘ. すミ; : ，: ， L 〆 1貝 ， モJ 、; 。心 、 、夕 、 正~弓: v 句、 J o ) Fig. 2.Philyra ・nishihiraiTakeda &Nakasone ，199 1. Male (6 .0by 5.4 mm) (MZB). Scale =1. 0mm . Pratiwi，13 July 2001; 1male (6.3 by 5.9mm) the present record being asubstantial range (ZRC) ，1 ovigerous female (7.6 by 7.0 mm) extension. Thetaxonomy of this species has (RCO) ，1 female (5.3 by 4.4 mm) (ZRC) ，1 been discussed in depth by Takeda & female (5.7 by 4.9 mm) (MZB) ，sandy-mud Nakasone (1991) ，who described it on the substrate in mangrove near river mouth， basis of one male and one female. 百le pre- Kamora，Irian Jaya ，lndonesia ，col l. I. sent series of specimens indicate that the Ermayanti，22 September 2001. form of the anterolateral margin does not va可 very much，with the lobes always den- Remarks. -The present specimens from tate (Fig .1a ，2). None of them havethe Irian Jaya (Figs. 1a，2 ，3) agree well with the anterolateral lobes as low as that of the figures and descriptions of this species by female paratype ぐrakeda & Nakasone，1991: Takeda & Nakasone (1991) from Okinawa， Fig. 2B). Overall figures (carapacewith even though they aresome distance away， legs) ，as well as figures of the female 4 D. L. RAHAYU & P. K L. Ng > (-ω ， (r g (. r ¥J 0."i_，)_. b ι 、， c 、0 4・ d 一ー一一一 一一- a，c d-f d e Fig. 3. Philyra nishihiraiTakeda &Nakasone ，199 1. a，c-f ，mal e(6 .0 by 5.4 mm) (MZB); b，g ，h ，oviger- ous female (7.0 by6.5 mm) (MZB). a. maleleft cheliped，b .female third maxilliped，dor sa lview ，c . malea bdomen，d ，e. male Gl，f. ma leG2 ，i. male third maxilliped，dor sa lview ，g .female abdomen，h. ventral view of femaleposterior margin of carapace. Scales =1. 0mm . abdomen and G2 areprovid edfor the first October 2000. Paratypes: 1male (7 .7by 7.5 time. mm) (ZRC) ，1 male (7.1 by 6.5 mm) (RCO) ， 1ov igerous female (7.2 by7.0 mm) (RCO)，1 Philyrαbicornis，new species ovigerous female (7 .4 by 7.0 mm) (ZRC) ， (Figs. 1b，4， 5) sam edata as holotype. Material examined. -Holotype: male (7.1 by 6.5mm) (MZB)，mud substrate in man- Etymology. -Th ename alludes to the groves，n ear river mouth，Kamora ，lrian projecting comers of the posterior carapace Jaya，lndon esia ，co ll. D .L. Rahayu，16 margin of the species. Thename is used as a MANGROVE LEUCOSIIDAE OFIRIAN JAYA 5 noun in apposition. and exopod denticulated ，with tufts of setae. Chelipeds about 1. 5times length of cara- Description (males). -Carapace slightly pace width. Anterior and posterior margin of broader than long，dorsal surface strongly merus tuberculated，outer surface covered convex，anterolateral ，posterolateral and pos- with large and small tubercles on proximal terior margins rimmed by obtuse tubercles ， half. Carpus about one-third length of lateral angle obtuse，posterolateral margin merus，outer surface with rows of tubercles sinuous; dorsal surface minutely granular， along upper and lower margins. Palm slight- with numerous large punctae which extend ly longer than dactylus ，outer surface to ventral surface ，regions indistinc t. smooth orwi出 scattered flattened tubercles， Cardiac，branchial and intestinal regions ele- upper and lower margins with dense tuber- vated，with large granules; large granules on cles. Cutting edges of 宣ngers with blunt den- cardiac region extend anteriorly to form 3 ticles ，tip of fixed fi. nger hooked. Outer sur- granular ridges on gastric region，median face of dactylus with 2longitudinal ridges， keel with small tubercles; intestinal elevation outer surface of fixed finger with shallow bearing large and small granules confluent longitudinal groove. with elevation on cardiac region; elevation Ambulatory legs subcylindrical; lengths on branchial region with large granules， decreasing gradually from fi. rst to last pair ， joined by oblique ridge at distal quarter. glabrous，upper and lower margins of meri， Large，shallow concavity between hepatic carpi and propodi se 汀 ated. and anterolateral margins. Front nearly Male abdomen with 3articulating seg- straight or slightly concave medially; hepatic ments (including telson) ，narrow; segments region excavated to form broad，shallow 1and telson free ，segments 2to 6fused ， depression; floor of sinus with median immovable，sutures indistinct. Segment 2 obtuse angle; upper margin of sinus not con- with scattered tubercles，suture between fluent with lower margin at outer portion; segment 5and 6visible as notch on either pterygostomial region with scattered tuber- side of abdomen; telson short，apex round- cles ，not swollen. Posterior margin concave ed，ending close to lower edge of buccal cav- with posterolateral angles produced. ern.τboracic stemum with large tubercles ， Antennules fold transversely ，antennular sternites interrupted ，印刷re between stem- fossa rectangular，external angle rounded. ites 1and 2indistinct ，visible only laterally. Basal segment of antennae embedded，fla- G1 long ，slender ，straight along most of gellum excluded from orbi t. Eye and orbit length ，tapering at tip ，加 ft of setae at distal small，eye retracts along orbital groove. one-sixth. G2 0.2 length of Gl，straight ，with Merus of third maxilliped with pointed spear-shaped structure distally ，expanded apex，0.8 times length of ischium along inner proximally，tuft of setae on inner side. margin，outer margin scarcely setose ，outer surface with row of minute tubercles; ischi- Description (females). -Similar to males um2.5 times longer 出an wide，outer surface except: posterolateral margin of carapace with 3rows of tubercles，largest tubercles relatively less produced; outer surface of adjacent to outer edge. Exopod much longer merus and ischium of third maxilliped with than wide，about twice length of merus，long longitudinal row of dense setae medially， setae on outer edge，outer surface with scat- margins of ischium，merus and exopod with tered tubercles; basis expanded，more than tuft of setae ，row of large tubercles near half length of exopod; carpus，propodus and outer margin of ischium; abdomen strongly dactylus not visible in external view when domed，highly punctate，covering most of reposed，articulating on inner surface of thoracic sternites; segments 3-6 fused， merus at about one-fifth distance from apex.
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