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First Record of Leucosiid Crabs (Crustacea: Decapoda: Brachyura) from the Kermadec Islands, with Description of a New Species

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First Record of Leucosiid Crabs (Crustacea: Decapoda: Brachyura) from the Kermadec Islands, with Description of a New Species Bull. Natl. Mus. Nat. Sci., Ser. A, 33(2), pp. 61–66, June 22, 2007 First Record of Leucosiid Crabs (Crustacea: Decapoda: Brachyura) from the Kermadec Islands, with Description of a New Species Hironori Komatsu1 and Masatsune Takeda2 1 Department of Zoology, National Science Museum, 3–23–1 Hyakunincho, Shinjuku-ku, Tokyo, 169–0073 Japan E-mail: [email protected] 2 Faculty of Modern Life, Teikyo Heisei University, 2289–23 Uruido, Ichihara, Chiba, 290–0193 Japan E-mail: [email protected] Abstract Three species of leucosiid crabs, Ebalia humilis Takeda, 1977, E. jordani Rathbun, 1906, and E. webberi, new species, are recorded from the Kermadec Islands, northern New Zealand. This is the first record of leucosiid crabs for the calcinological fauna of the Kermadec Is- lands. Ebalia webberi appears most similar to E. sakaii Takeda & Miyake, 1972 from Japan, but can be easily distinguished from E. sakaii by the shape of the carapace, cheliped, and male first pleopod. Key words : Kermadec Islands, South Pacific, Brachyura, Leucosiidae, new species, new record. Introduction from ischium to dactylus. The specimens exam- Under the special project on Collection Build- ined are deposited in the Museum of New ing and Natural History Studies in Asia and the Zealand Te Papa Tongarewa (NMNZ) and the Pacific Rim, supported by the National Museum National Museum of Nature and Science of Nature and Science (former National Science (NSMT). Museum, Tokyo), a collection of brachyuran crabs from the Kermadec Islands was taxonomi- Taxonomy cally studied. The results of the identifications were summarized and presented at the Seventh Family Leucosiidae Symposium of this project (Takeda and Webber, Ebalia humilis Takeda, 1977 2004), and a new spider crab of the genus (Fig. 1A) Achaeus from the collection was described (Web- Ebalia humilis Takeda, 1977: 115, figs. 2 (A, B), 3 (B–D). ber and Takeda, 2005). Subsequently 52 species in 17 families were reported by Takeda and Web- Material examined. Between Dayrell and ber (2006), but some groups of crabs were left Chanter Is. (29°15ЈS, 177°50.9ЈW), Herald Islets, unidentified to species. In this paper, we report Kermadec Is., New Zealand, 31–45 m, 1 ovig. / three species of leucosiid crabs, including one (3.5ϫ4.2), NMNZ CR. 011249, coll. RV Acheron, new species, and add these species to the calcino- 11 Sep. 1976. logical fauna of the Kermadec Islands, New Remarks. The present specimen agrees with Zealand. the original description in general morphology, Measurements, given in millimeters (mm), are but compared with the holotype, ovigerous fe- of the greatest carapace length (including the male (NSMT-Cr 5489) from the Ogasawara Is- posterior lobe) and breadth, respectively. lands, southern Japan, the ornamentations of the Pereiopods are measured along the outer margin carapace and chelipeds are weak. That is, tuber- 62 Hironori Komatsu and Masatsune Takeda Fig. 1. A, Ebalia humilis Takeda, 1977, ovig. / (3.5ϫ4.2 mm; NMNZ CR. 011249). B, Ebalia jordani Rathbun, 1906, / (15.4ϫ15.7 mm; NMNZ CR. 011250). cles on the pterygostomian region of the cara- Distribution. Hawaiian Islands and Ker- pace and on the chelipedal merus are absent, and madec Islands, occurring at depths of 55–385 m. a projection on the metabranchial margin is weak. These differences are shared with the Ebalia webberi sp. nov. paratype, female (NSMT-Cr 5490), and may be a (Figs. 2, 3) morphological feature of a full-grown female specimen. Material examined. Holotype: ? (3.7ϫ4.1), Distribution. Ogasawara Islands and Ker- NMNZ CR. 011251, between Meteorological madec Islands, occurring at depths of 31–84 m. Station and Hutchinson Bluff (ca. 29°10ЈS, 177° 50ЈW), Raoul I., Kermadec Is., New Zealand, beam trawl, 146–110 m, coll. RV Acheron, 4 Apr. Ebalia jordani Rathbun, 1906 1973. (Fig. 1B) Description. Carapace (Fig. 2A) subrhom- Ebalia jordani Rathbun, 1906: 889, pl. 15(3). boidal in general outline, 1.1 times broader than ϭ Not Ebalia jordani: Yokoya, 1933: 121 ( E. nudipes long; upper surface convex dorsally, uniformly Sakai, 1963). covered with acute granules, granules elongate Material examined. East of Chanter Islets around margin. Frontal region moderately pro- (29°15.5ЈS, 177°50ЈW), Raoul I., Kermadec Is., duced, shallowly concave medially; margin divid- New Zealand, 402–366 m, 1 / (15.4ϫ15.7), ed into 4 lobes with shallow notches. Gastro-car- NMNZ CR. 011250, coll. RV Acheron, 28 Oct. diac region raised, not divided from each other, 1975. with pair of tubercles on gastric region and tuber- Remarks. This is the first record of this cle on cardiac region; gastric tubercles directed species since the original description, and ex- dorsally; cardiac tubercle directed dorsally, about tremely extends its geographical distribution twice as large as gastric tubercles. Intestinal re- from Hawaii to the South Pacific. The present gion protuberant, with subapex tubercle; margin specimen agrees well with the original descrip- triangularly projected beyond posterior lobes. tion in general morphology, but the dactyli of Hepatic region weakly defined; margin not pro- ambulatory legs are distinctly setose. This char- truded from general outline of carapace. Ptery- acter was not described and illustrated in the gostomian margin diverged, obtusely angled at original description. posterior 0.3 with small cluster of granules, Leucosiid Crabs from the Kermadec Islands 63 Fig. 2. Ebalia webberi sp. nov., holotype, ? (3.7ϫ4.1 mm; NMNZ CR. 011251). A, B, dorsal and ventral views, respectively. 64 Hironori Komatsu and Masatsune Takeda forming right angle with branchial margin. with two triangular projections on outer margin; Branchial region sloping antero-laterally, with 3 carpus convex; palm convex dorsally, arcuate on small clusters of granules on mid portion; margin inner margin, with triangular projection on proxi- roundly convex in anterior half, obliquely conver- mal 0.3 of outer margin; fingers slender, finely gent in posterior half, with acute triangular pro- dentate on both cutting edges, without gap when jection on midlength and right-angled triangular closed; movable finger about 1.4 times as long as projection on posterior 0.2. Posterior margin sep- palm. arately bilobed, lobes obtusely triangular with Ambulatory legs (Figs. 2, 3d) of moderate rounded tip. length, covered with minute granules except Ocular peduncle very short. Orbit with 2 dactyli, granules along margins acute, sparsely straight fissures on dorsal roof, with V-shaped furnished with short plumose setae; coxal notch on infraorbital margin; orbital hiatus condyles rounded; meri, carpi, and propodi sub- closed with second segment of antenna. Anten- cylindrical; dactyli subconical, smooth, with nule folded into slightly oblique fossa; basal seg- inconspicuous dactylo-propodal locks on proxi- ment occupying ventral 0.6 of fossa, not covered mal ends of dorsal surfaces. with granules. Antennal basal segment trans- Thoracic sternites (Fig. 3e): 1st to 4th sternites versely ovate, second segment subrectangular. fused with each other, with partial suture be- Afferent channel with V-shaped notch on anterior tween 3rd and 4th sternites, covered with acute margin. granules of various sizes; 5th to 8th sternites cov- Mandible well calcified, cutting edge triangu- ered with vesicular granules, separated from each lar in outline, pointed medially; endopod palp 3- other by medially interrupted sutures; epistern- segmented. Maxillule: endopod small, triangular. ites not divided; abdominal cavity reaching near- Maxilla: coxal and basial endites missing; endo- by anterior end, roundly concave on distal part so pod triangular, with rounded tip; exopod as tip of first pleopod fit into this concavity; me- (scaphognathite) longitudinally expanded into dian fissure absent. oval structure, entirely fringed with short, Abdomen (Figs. 2B, 3f) covered with vesicular plumose setae. First maxilliped: exopod bearing granules of various sizes; 1st segment short, flagellum with some weakly plumose, terminal transversely subrectangular, concealed beneath setae. Second maxilliped: exopod bearing flagel- carapace for most part; 2nd segment very short, lum with some terminal setae; exodite absent. transversely subrectangular, medially interrupted; Third maxilliped (Fig. 3a, b) covered with acute main fused section composed of 3rd to 5th seg- granules of various sizes; basis fused with ischi- ments, elongate trapezoidal, weakly constricted um, but with remnant suture on internal surface; at distal 0.4, with large, acute triangular tooth ischium subsquamate; merus gently bent dorsally nearby distal margin, tooth directed ventrally; tel- in situ, as long as ischium along mesial margin; son triangular. propodus and dactylus with distally denticulate Male first pleopod (Fig. 3g, h) robust, roundly setae along distal and inner margins, dilated and translucent in distal half, with 2 acute respectively; exopod subsquamate, scarcely processes on sternal surface. Male second pleo- tapering distally, rounded at tip, fringed with pod (Fig. 3i) short, about 0.5 times as long as short plumose setae on lateral margin; internal first one, subcylindrical, crested; distal joint exopodal ridge scarce, with moderately long tubular, laterally pointed setae along ridge; epipod reduced, not well calci- Etymology. This species is dedicated to Mr. fied; podobranch absent. R. Webber of the Museum of New Zealand Te Cheliped (Fig. 3c) slender, 1.9 times as long as Papa Tongarewa, who takes responsibility for the carapace, covered with granules of various sizes;
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