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Galathea Coralliophilus, a New Decapod Crustacean (Anomura: Galatheidae) from Singapore, Gulf of Thailand, and West Irian

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Galathea Coralliophilus, a New Decapod Crustacean (Anomura: Galatheidae) from Singapore, Gulf of Thailand, and West Irian 28 June 1990 PROC. BIOL. SOC. WASH. 103(2), 1990, pp. 358-363 GALATHEA CORALLIOPHILUS, A NEW DECAPOD CRUSTACEAN (ANOMURA: GALATHEIDAE) FROM SINGAPORE, GULF OF THAILAND, AND WEST IRIAN Keiji Baba and Sang-Chul Oh Abstract. — Galathea coralliophilus, a new galatheid crustacean, is described and illustrated. The new species is common in association with reef corals in Singapore and the Gulf of Thailand. Galathea spinosorostris reported by John­ son (1970:6) from Singapore and Galathea aff. consobrina described by Gordon (1935:5) from West Irian are synonymized with the present species. During ecological studies on the coral University, and part will be sent to the communities of the Gulf of Thailand in Smithsonian Institution. Locations of sta­ 1984, Dr. Y. Nakasone collected galatheid tions where the Thailand survey was carried crustaceans commensal with several species out can be found in Nakasone et al. (1986: of reef corals and made them available to fig. 1). The measurements of the specimens one of us (KB) for identification; they were examined are given in parentheses under immediately identified as an undescribed "Material," showing minimum and maxi­ species of Galathea. Recently, Singaporean mum carapace lengths in millimeters taken galatheids in the collection of the National between the rostral tip and midpoint of the University of Singapore (Zoological Refer­ posterior margin of the carapace. The host ence Collection [ZRC]), taken mostly on corals from Thailand have been identified coral reefs, rarely from crinoids or fouling by Kazuhiko Sakai (see Nakasone et al. rubbles on a ship or among fouling com­ 1986:155), and those, as well as a host cri­ munity, were made available for study. They noid, from Singapore have been determined comprise two species: one of them is Allo- by Beverly Goh (Peter Ng, pers. comm.). galathea elegans (Adams & White), a com­ mon crinoid associate in the Indo-West Pa­ Galathea coralliophilus, new species cific, and the other is identical with the Fig. 1 Thailand species, as well as with the species reported by Johnson (1970:6) as Galathea Galathea aff. consobrina.— Gordon, 1935: spinosorostris, which, according to him, is 5, figs. 2, 3a, b. the only shore galatheid in Singapore. How­ Galathea spinosorostris. —Johnson, 1970:6, ever, Johnson's identification is incorrect, fig. lb. [NotG. spinosorostris Dana, 1852.] as the identity of Galathea spinosorostris Material.— Thailand: Khang Khao Is­ Dana, 1852 has recently been established land, sta. B, 26 Oct 1984, on Pavona fron- (Baba 1988:78). In addition, examination difera Lamarck: 1 ovig. 9 (3.5); on Pocillo- of the literature discloses that Galathea aff. pora damicornis Linnaeus: 4 $ (3.1-5.5), 2 consobrina from West Irian (Gordon 1935: ovig. 2(3.7, 5.1); 15 Nov 1984, on P. dami­ 5) should also be merged with the new cornis: 1 <5 (4.5), 1 ovig. 9 (3.8), 1 2 (3.2); species. sta. C, 25 Oct 1984, on P. damicornis: 1 8 Most of the material from Thailand is (3.0). Samui Island, sta. 1, 10 Nov 1984, on retained in the collection of Kumamoto Acropora sp.: 12 (3.5); on Psammocora con- VOLUME 103, NUMBER 2 359 tigua (Esper): 4 <3 (2.8-4.8). Singapore: Pulau Description of holotype.— Carapace ex­ Hantu, North, 12 Aug 1986, coll. B. Goh, cluding rostrum and lateral spines nearly as on Acropora (Acropora) tenuis (Dana): 1 & long as wide, dorsal surface with distinct (4.7) (ZRC 1987.2555); Pulau Hantu, South, transverse ridges as figured, cervical groove 19 Aug 1986, on Pavonafrondifera: 2 9 (4.1, indistinct; first transverse ridge with pair of 4.3) (ZRC 1987.2558-2559); Pulau Hantu, submedian spines, each spine accompanied West, 19 Sep 1986, on Pocillopora dami- by feathered seta mesial to it, also lateral to cornis: 3 S (3.7-5.3), 1 9 (4.9) (ZRC it on left side only; scale-like ridge present 1987.2582-2585). Cyrene Reef, 15 Aug directly behind second transverse ridge, 1986, coll. B. Goh, on Pavona decussata bearing 4 pits for roots of stiff feathered se­ (Dana): 1 ovig. 9 (4.3+), 1 9 (3.7+) (ZRC tae. Lateral margins convex, bearing 7 1987.2556-2557). Pulau Semakau, 22 Aug spines, first (anterolateral) pronounced, sec­ 1986, coll. B. Goh, on Pavonafrondifera: 1 ond small and somewhat dorsal in position, 3 (4.5), 2 ovig. 9 (4.4, 4.1+), 1 9 (cephalo- third to seventh located behind end of cer­ thorax missing) (ZRC 1987.2560-2563); on vical groove, fifth largest. Another spine Cyphastrea serailia (Forskal): 1 $ (3.9), 1 9 ventral to level of second lateral marginal (carapace missing) (ZRC 1987.2564-2565); spine and somewhat anterior to anterior end on Pavona cactus (Forskal): 1 $ (4.8) (ZRC of linea anomurica. Outer angle of orbit 1987.2566); coll. G. Lim, on crinoid Co- strongly produced, ending in sharp point. master gracilis (Hartlaub): 1 3 (5.3) (ZRC Rostrum broadly triangular, 1.4 times as 1987.2596). Pulau Jong, 26 Aug 1986, coll. long as wide when measured between in­ B. Goh, on Pocillopora damicornis: 1 ovig. cisions formed by 2 proximal teeth, dorsal 9 (4.4+) (ZRC 1987.2567). Pulau Jong, surface with several pronounced feathered South, 24 Oct 1986, coll. B. Goh, on Pavona setae in addition to fine simple ones, lateral frondifera: 1 ovig. 9 (5.5) (ZRC 1987.2595). margin with 4 sharply incised teeth, basal Raffles Lighthouse, 2 Sep 1986, coll. B. Goh, lateral tooth smaller, ultimate lateral tooth on Acropora {Acropora) willisae Veron & terminating opposite midlength of rostral Wallace: 1 6 (5.1) (ZRC 1987.2568); on Po­ median spine. cillopora damicornis: 3 3 (3.7-4.8), 1 ovig. Eyestalks with few feathered setae near 9(4.2), 1 9 (4.7) (ZRC 1987.2569-2573); 16 mesial limit of terminal fringe of very fine Oct 1986, on Pocillopora damicornis: 1 3 setae proximal to cornea. (4.9), 1 ovig. 9 (5.9) (ZRC 1987.2586-2587); Abdominal segments sparsely provided on Pavonafrondifera: 3 3 (4.5-6.3), 1 9 (6.0) with feathered setae as illustrated; second (ZRC 1987.2588-2591) [largest male is ho- and third segments each with 4 transverse lotype]; on Pavona decussata: 2 3 (4.5, 5.6), ridges, first (anterior) ridge elevated, second 1 ovig. 9 (4.5) (ZRC 1987.2592-2594). Ter- ridge medially interrupted by considerable embu Pempang Laut, South, 9 Sep 1986, space, third ridge uninterrupted, accompa­ coll. B. Goh, on Pocillopora damicornis: 5 nying groove anterior to it, fourth ridge faint 3 (4.0-6.4), 3 ovig. 9 (3.7-5.2) (ZRC and medially interrupted. 1987.2574-2581). Southern Islands, Dec 1986, coll. J. B. Sigurdson, from fouling Pterygostomian flap anteriorly ending in rubble on ship: 1 3 (6.4), 1 ovig. 9 (4.8) (ZRC sharp spine, bearing small spine on second 1987.2597-2599). Sentosa Reef, Dec 1985, ridge. coll. P. Ng: 2 3(3.7, 4.1), 2 ovig. 9 (3.9, 4.1) Basal segment of antennule with 3 well (ZRC 1987.2600-2603). Pulau Busing, 1 developed terminal spines, distal segment May 1987, coll. J. B. Sigurdson, from foul­ with tuft of pronounced terminal setae. First ing community: 2 ovig. 9 (4.5, 5.2) (ZRC (proximal) segment of antennal peduncle 1987.2604-2605). with rather long distomesial spine nearly reaching end of third segment; second seg- 360 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON ment with distomesial and distolateral spines, ventral margins with 4 spinelets on spines of subequal size; third segment with first leg, 3 on second leg and 3 or 4 on third small distomesial spine. leg; dactyli ending in strongly curved sharp Third maxilliped having ischium with claw, ventrally bearing 5 teeth each with stiff small distoventral and short but stout dis- seta at base, all these teeth and setae de­ todorsal spines, mesial ridge with 23 den­ creasing in size toward base of segment. ticles; merus with 2 well developed ventral Epipods present on chelipeds, absent from spines on distal half of length, distal one walking legs. present at midlength of space between prox­ Variation.— The scale-like ridge imme­ imal spine and distal end of ventral margin; diately behind the second transverse ridge dorsal margin with distodorsal spine of small is absent in only two of the 66 specimens size and eminence proximal to it; carpus examined. In these two, the second stria is unarmed but with 3 eminences on dorsal interrupted at midpoint and both of their margin; dactylus elongate. mesial limits are directed posteriad. The Third thoracic sternum depressed below feathered seta mesial to each epigastric spine level of following sternum, anteriorly nar­ is consistently present, and an additional rowed, anterior margin with distinct me­ one lateral to it is present in two specimens dian notch. including the holotype. The spine on the Chelipeds 2.7 times as long as carapace, pterygostomian flap is usually very tiny, oc­ provided with coarse setae in moderate den­ casionally discernible only under high mag­ sity and very spinose as illustrated; merus nification, and very rarely obsolete (in two with 5 rows of spines, distal 2 of mesial specimens). The propodal ventral spinelets marginal spines prominent; carpus with 5 vary from two to five (mostly four) on the rows of spines, penultimate of mesial mar­ first walking leg, two to four (mostly three) ginal spines very strong; palm about 3 times on the second walking leg, one to four as long as wide, with 4 rows of spines on (mostly three, occasionally two) on the third dorsal surface and mesial and lateral mar­ walking leg. The merus of the third walking gins; fingers gaping, touching each other with leg bears three to five (mostly four) spines several intermeshing teeth at tip when on the dorsolateral surface near dorsal mar­ closed; movable finger 0.57 as long as palm, gin, in addition to a distodorsal one.
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