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Crustacean Research 44 Crustacean Research 44 NEW CAVERNICOLOUS XANTHID CRAB from the RYUKYUS

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Crustacean Research 44 Crustacean Research 44 NEW CAVERNICOLOUS XANTHID CRAB from the RYUKYUS Crustacean Research Vol.44: 21–27 ©Carcinological Society of Japan. doi: 10.18353/crustacea.44.0_21 Lipkemera iejima, a new cavernicolous crab (Brachyura: Xanthidae) from a submarine cave at Ie Island, central Ryukyu Islands, Japan Tohru Naruse, Yoshihisa Fujita Abstract.̶ A new species of the genus Lipkemera Davie, 2010, is described from a submarine cave at Ie Island, Ryukyu Islands, Japan. Lipkemera iejima, new species, can be distinguished from congeners by the characters of ambulatory legs and the re- gionation of the dorsal surface of the carapace. The present study brings the number of Lipkemera species to five. A key to species of Lipkemera is also provided. Key words: Taxonomy, description, new species, Liomerinae ■ Introduction second gonopods, respectively. Specimens ex- amined are deposited in the Ryukyu University The liomerine genus Lipkemera Davie, 2010, Museum, Fujukan (RUMF), University of the is a replacement name of Meriola Davie, 1993, Ryukyus, Okinawa, Japan. which was established to accommodate M. ru- fomaculata Davie, 1993, and Neoliomera acu- ■ Taxonomy tidens Sakai, 1969. Meriola Davie, 1993, is a junior homonym of a spider genus Meriola Family Xanthidae MacLeay, 1838 Banks, 1895 (Araneae: Corinnidae). Subse- Subfamily Liomerinae Sakai, 1976 quently, M. corallina Takeda & Marumura, Lipkemera Davie, 2010 1997, and L. holthuisi Mendoza, 2010, has Lipkemera iejima, new species been added to the genus. Lipkemera species (Figs. 1–4) appear to inhabit relatively deeper waters; L. http://zoobank.org:pub:B1CA1918-0546- rufomaculata from depths of 240 and 270 m of 45E6-B1F4-3F9E273EA3F2 Tuamotu Archipelago; L. acutidens and L. cor- allina from depths of 30–50 m and 60–80 m, Material examined respectively, off Wakayama, Honshu, Japan; Holotype: RUMF-ZC-1717, male, 11.0× while L. holthuisi was from depths of 50– 17.5 mm, point “Ohoba No. 2”, Ie Island, 200 m, off Panglao Island, central Philippines. Ryukyu Islands, Japan, 17 m, submarine cave, Recently an undescribed liomerine species that coll. K. Yunokawa, 28 Jul. 2011. Paratype: is referable to Lipkemera was found inhabiting RUMF-ZC-2468, 1 female, 15.8×25.3 mm, a submarine cave with a depth of only 17 m at same locality as holotype, coll. K. Yunokawa, Ie Island, adjacent to Okinawa Island, Ryukyu 18 May 2013. Islands, Japan. The present study describes the species and compares it with congeners. Comparative material The measurements provided, in millimetres, Lipkemera corallina Takeda & Marumura, are carapace length (CL) and width (CW) re- 1997: ZRC, 4 males, 15.3×24.8–20.4× spectively. The abbreviations P2–P5, G1 and 33.4 mm, Panglao Island, central Philippines, G2 are used for pereopods 2–5, male first and 80–140 m, tangle net, coll. J. Arbasto, 2004– Received: 6 Apr 2015; Accepted: 24 July 2015; Published online 11 September 2015 21 TOHRU NARUSE, YOSHIHISA FUJITA 2005. Lipkemera holthuisi Mendoza, 2010: length, second most produced laterally among ZRC, 1 male, 16.0×25.9 mm, Doljo, Panglao all lobes (although relatively low), third lon- Island, central Philippines, ca. 50 m, rocky bot- gest. In paratype, first 2 lobes almost fused on tom, tangle net, coll. J. Arbasto, 1 Jul. 2011. right side, divided into 3 lobes on left side. Junction between antero- and posterolateral Diagnosis margins marked by stout tooth just posterior to Carapace oval, dorsal surface covered with fourth lobe, directed outwards, representing microscopic granules, regions poorly defined, widest part of carapace. one longitudinal groove from frontal margin Antennular articles folding almost trans- bifurcated posteriorly, 3M (meso- and meta- versely, inter-antennular septum narrow. Basal gastric regions) barely discernible anteriorly; antennal segment rectangular, placed almost groove indiscernible in female paratype. Exter- vertically, filling gap between ventral extention nal orbital corner not angulated. Corner fol- of lateral corner of front and inner orbital lowed laterally by 4 lobes, 1 stout tooth; first tooth. lobe short, oblong protuberance, second to Posterior margin of epistome nearly straight, fourth lobes continuous, rimmed; first, second with median notch. lobes subequal in length, second most pro- Third maxilliped (Fig. 2) rectangular, mid- duced laterally among all lobes (although rela- length of ischium about twice of merus, with tively low), third longest. Junction between longitudinal groove on mesial two-fifths. antero- and posterolateral margins marked by Male thoracic sternite 3 markedly divided stout tooth just posterior to fourth lobe, dire- from sternite 4 by posteriorly arched groove. cted outwards, representing widest part of Male sterno-abdominal cavity reaching level of carapace. Ambulatory legs relatively long, meri posterior third of cheliped bases. Vulvae with weakly convex anterior, posterior obliquely oval, with small triangular sternal margins. G1 slender, distal part slightly curved cover, placed close to each other on anterior distal-ward. half of thoracic sternite 6. Chelipeds subequal (Fig. 1), surface appear- Description ing smooth, but covered with tiny granules. Carapace (Fig. 1a) oval, CW 1.58 times CL, Carpus rounded, inner angle with 2 rounded dorsal surface convex longitudinally and trans- teeth, posterior tooth longer than anterior tooth versely, covered with microscopic granules, (Fig. 3b). Chela (Fig. 3a) relatively long, palm glabrous, regions poorly defined, one longitu- (along lower margin) twice of height. Fingers dinal groove from frontal margin bifurcated nearly straight, with curved distal portion, posteriorly, 3M (meso- and metagastric re- slightly hoof-like distally, occlusal margins gions) barely discernible anteriorly; groove in- lined with lamellar, triangular teeth. Immov- discernible in female paratype. Front not able finger lined with 1 row of pits each on strongly produced, bilobed. Orbital margin en- outer and inner surfaces. Movable finger with tire; supraorbital margin thickly rimmed; infra- 1 groove on inner and outer surface each, and orbital margin (Fig. 2) wide, granulated, inner 2 grooves on upper surface (Fig. 3b), regions end rounded, produced anteriorly, leaving gape between grooves rim-like. Ambulatory legs rel- for antenna. External orbital corner not angu- atively long (Figs. 1, 4a, b), relatively slender, lated. Corner followed laterally by 4 lobes, 1 meri with weakly convex anterior, posterior stout tooth in holotype; first lobe short, oblong margins, lined with long setae and granules, protuberance, second to fourth lobes continu- especially on distoanterior margin of meri and ous, rimmed; first, second lobes subequal in outer margin of carpi to dactyli. Dactylo-prop- 22 Crustacean Research 44 Crustacean Research 44 NEW CAVERNICOLOUS XANTHID CRAB FROM THE RYUKYUS Fig. 1. Lipkemera iejima, new species. Holotype, RUMF-ZC-1717, male, 11.0×17.5 mm. a, dorsal view; b, ventral view. odal articulation of each leg forming special- cealed under posterior margin of carapace. ized locking mechanism consisting of Second somite slightly narrower than first so- distoflexor semicircular extension with disto- mite. Third to fifth somites fused, with lateral extensor concavity of propodus and basal tu- short fissures between fourth and fifth somites; bercle on either side of dactylus. Dactylus fused somites widest proximally, gradually straight, tip only slightly curved inwards. narrowed distally. Sixth somite as long as tel- Abdomen (Figs. 1b, 4c) relatively narrow. son, only slightly narrower than telson. First somite with proximal part partially con- G1 (Fig. 4d, e) slender, distally curved distal- Crustacean Research 44 Crustacean Research 44 23 TOHRU NARUSE, YOSHIHISA FUJITA Fig. 2. Lipkemera iejima, new species. Holotype, RUMF-ZC-1717, male, 11.0×17.5 mm. Anterior part of cephalothorax, anteroventral view. ward; distal end spatulate, dorsal side of distal part lined with about 15 long plumose setae along inner part of distolateral margin, fol- lowed proximally by 1 row of small spinules over distal half. G2 (Fig. 4f) small, shorter than one-third of G1. Etymology The new species is named after its type local- ity, Ie Island (Ie-jima in Japanese). The name is used as a noun in apposition. A standard Japa- nese name Yunokawa-hira-ougigani is also proposed here. Ecological note Lipkemera iejima, new species, was collected from a submarine cave. Lipkemera iejima, new Fig. 3. Lipkemera iejima, new species. species, was observed not from the bottom of Holotype, RUMF-ZC-1717, male, 11.0× the cave with silty substratum but from holes 17.5 mm. a, major chela (left), outer view; b, on walls of the cave. Catoptrus iejima Fujita & major cheliped (left), upper view. Naruse, 2011 (Portunidae) and Bresilia rufiocu- lus Komai & Yamada, 2011 (Bresiliidae) were also recorded from the same cave (Fujita & 24 Crustacean Research 44 Crustacean Research 44 NEW CAVERNICOLOUS XANTHID CRAB FROM THE RYUKYUS Fig. 4. Lipkemera iejima, new species. Holotype, RUMF-ZC-1717, male, 11.0×17.5 mm. a, right P3 (second ambulatory leg), upper view; b, right P5 (fourth ambulatory leg), upper view; c, abdomen, ventral view; d, left G1, ventral view; e, distal part of left G1, ventral view; f, left G2, ventral view. Setula of G1 and G2 are not drawn. Scales: a, b＝5 mm; c, d, f＝1 mm; e＝0.5 mm. Naruse, 2011; Komai & Yamada, 2011). carapace (vs. well defined carapace regions), not clearly marked first anterolateral tooth (vs. Remarks distinct tooth present), and only slightly Davie (1993) distinguished Lipkemera (as oblique basal antennal segment (vs. obliquely; Meriola) from allied genera including mono- ca. 45°) positioned basal antennal segment in typic Bruciana Serène, 1977, which was estab- Bruciana), and with long, slender and straight lished as a subgenus of Liomera Dana, 1851, to ambulatory legs (those of Bruciana are rela- accommodate Carpilodes pediger Alcock, tively longer than those of typical Liomera, but 1898. The former was distinguished from the still shorter than Liomera and with convex latter by only moderately defined regions of the meri margins). The present new species is best Crustacean Research 44 Crustacean Research 44 25 TOHRU NARUSE, YOSHIHISA FUJITA assigned to Lipkemera in its carapace charac- carapace … L. acutidens (Sakai, 1969) ters.
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