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A New Species of Lepidozona (Mollusca, Polyplacophora, Ischnochitonidae) from Okinawa Trough, East China Sea

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A New Species of Lepidozona (Mollusca, Polyplacophora, Ischnochitonidae) from Okinawa Trough, East China Sea Bull. Natl. Mus. Nat. Sci., Ser. A, 39(1), pp. 5–10, February 22, 2013 A new species of Lepidozona (Mollusca, Polyplacophora, Ischnochitonidae) from Okinawa Trough, East China Sea Hiroshi Saito Department of Zoology, National Museum of Nature and Science, 4–1–1 Amakubo, Tsukuba, Ibaraki, 305–0005 Japan E-mail: [email protected] (Received 7 December 2012; accepted 18 January 2013) Abstract A new species of chiton, Lepidozona (Tripoplax) alba is described from Okinawa Trough, East China Sea, at the depth from 576–611 m. The new species is distinguishable from other congeneric species by the flat radiating ribs lacking of granular sculpture on the valves, smooth dorsal girdle scales with long apical spines, and the deep-sea habitat. The new species appears to inhabit a chemosynthetic environment. Key words : chiton, new species, chemosynthetic environment, Minami-Ensei Knoll, Japan. saki University, and a chiton specimen was col- Introduction lected in the latest cruise in November 2012 The Minami-Ensei Knoll, northern Okinawa close to St. OT-6. Examination of those chiton Trough has been known to have an active hydro- specimens revealed that all belong to a single thermal vent and a warm seepage at the depth new species of the genus Lepidozona (Tripo- from 670 to 710 m (Okutani et al., 1992). From plax), which is described herein. this vent site, two molluscan taxa, a turbinid gas- tropod, Thermocolonia jamsteci Okutani and Material and Methods Fujikura, 1990 [＝Cantrainea jamsteci (Okutani and Fujikura, 1990) (fide Okutani, 2000)] and a For SEM observation, pieces of girdle and rad- vesicomyid bivalve, Calyptogena solidissima ula were dissected, and macerated with house- Okutani et al., 1992 [＝Calyptogena kawamurai hold bleach, rinsed with water, cleaned with an (Kuroda, 1947) (fide Kojima et al., 2006)] were ultrasonic cleaner, dehydrated with ethanol described. During the survey cruise to the series, then transferred to t-butyl alcohol, and Ryukyu Islands area by R/V Hakuho-Maru of the freeze-dried with JEOL-JFD300 freeze drying Japanese Agency of Marine Science and Tech- device. Dried specimens were coated with gold- nology Center in 2005, a large number of mollus- palladium. SEM images were taken with high can shells, including living Calyptogena kawam- vacuum mode with low accelerating voltage, urai were collected in the neighboring area of the 1.0 kV. Minami-Ensei Knoll, at the depth of 576–594 m Terms for the gill arrangement follow Sirenko (St. OT-6). Those molluscan samples included a (2006). small ischnochitonid chiton and three large disar- All specimens were deposited in the molluscan ticulated intermediate valves which were tenta- collection of the Department of Zoology, tively identified as a species of the genus Lepi- National Museum of Nature and Science, Tsu- dozona. Subsequently, this area was surveyed kuba (formerly National Science Museum, several times by R/V Nagasaki-Maru of Naga- Tokyo: NSMT). 6 Hiroshi Saito Systematics weakly rounded, hind margin nearly straight or slightly concave; apices weakly protruding; lat- Class Polyplacophora Gray, 1821 eral areas raised (Figs. 5–7). Tail valve less than Order Chitonida Thiele, 1910 semicircular, narrower than head valve, which Family Ischnochitonidae Dall, 1889 length is nearly half the width; mucro well defined, located slightly behind centre (Fig. 8); Genus Lepidozona Pilsbry, 1892 postmucronal slope slightly concave. Subgenus Tripoplax Berry, 1919 Head valve, lateral areas of intermediate Type species: Trachydermon trifidus Carpenter, valves and posterior area of tail valve cut by 1864, by original designation shallow sulci into low, flat, smooth radiating ribs: 24 in head valve, 3–4 in lateral areas, 26 in post- Lepidozona (Tripoplax) alba sp. nov. mucronal area; sulci in posterior area very weak. Pleural areas sculptured with rather irregularly (Figs. 1–17) arranged longitudinal riblets, 18–20 in each side, and fine commarginal riblets; crossing points of Material examined. Holotype: NSMT-Mo both riblets often granularly raised. Sculpture of 78478, body length 32 mm, near Minami-Ensei jugal area weak, finely reticulate with low Knoll area, northern Okinawa Trough, R/V oblique riblets (Figs. 4–6, 8). Nagasaki-Maru St. J6–1, 28°32.080′N, 127° Articulamentum white; sutural laminae wide, 01.894′E–28°34.126′N, 127°02.546′E, 605–611 short, more or less rounded, connected across m, on sunken wood, 16 Nov. 2012. Paratypes: 1 shallow sinus by short, slightly concave jugal small individual, NSMT-Mo 78479, body length plate, weakly notched at both sides (Figs. 5, 6, 8, 9.8 mm, near Minami-Ensei Knoll, Okinawa 9). Insertion plates squarish, short, outer surface Trough, R/V Hakuho-Maru St. OT-6, 28° rough with minute grooves. Slit formula 16/2– 32.22′N, 127°01.84′E–28°31.05′N, 127°01.49′E, 3/10. 576–594 m, on dead shell, 13 May 2005; 3 inter- Girdle of moderate width (Fig. 1), covered mediate valves, NSMT-Mo 78480, valve width with loosely imbricating, obliquely implanted, 10.6 mm, 23.2 mm and 24.0 mm, same locality bent, almost smooth scales, up to 370 μm in with another paratype, NSMT-Mo 78479. width, 300 μm in length, with long, longitudi- Type locality. Minami-Ensei Knoll area, nally grooved apical spine (Fig. 12). Surface of northern Okinawa Trough, 28°32.080′N, 127° scales near girdle margin with numerous weak 01.894′E–28°34.126′N, 127°02.546′E, 605– longitudinal riblets. Marginal fringe composed of 611 m. long, slender, straight, blunt-topped, smooth nee- Description of holotype. Animal large, dles, ca. 170×22 μm, sheathed on a long chitin- 32 mm in body length, 19 mm in body width, ous stalk (Fig. 13), very small, rather coarsely oval (Figs. 1, 2). Valves moderately elevated, grooved, also stalked spicules, 40–58×10 μm, carinated in dorsum, hardly beaked, slightly con- and wedge shaped, obliquely grooved, blunt- vex in side slopes. Dorsal elevation 0.35 in valve topped spicules, ca. 150×40–48 μm (Fig. 14). IV, which lowering towards tail valve (Figs. Ventral side of girdle paved with partly overlap- 5–8). Color of valves and girdle white, partially ping rows of needles which are similar to the covered with blackish foreign deposit. long stalked needle at the girdle margin, 160– Head valve semicircular, with shallow apical 190×ca. 20 μm (Fig. 15). notch, almost straight in anterior slope (Fig. 4). Gills holobranchial, adanal, with space, 38 Intermediate valves broadly rectangular; anterior ctenidia on each side. Posterior 7–10th ctenida margin slightly convex at both sides of somewhat largest (Fig. 2). forwardly produced jugal area; side margin Radula 11 mm in length with 38 transverse New Chiton from Okinawa Trough 7 Figs. 1–11. Lepidozona alba n. sp. ― 1, 2, 4–9, holotype, NSMT-Mo 78478; 3, paratype, NSMT-Mo 78479; 10–11, paratypes, NSMT-Mo 78480. ― 1, 2, Intact animal, dorsal and ventral view. 3. Small animal, dorsal view. 4, Head valve, dorsal view. 5, Valve II, dorsal view. 6, 7, Valve IV, dorsal and frontal views. 8, 9, Tail valve, dorsal and ventral views. 10, 11, Sculpture of intermediate valves. Scales: 10 mm for 1 and 2; 5 mm for 3–11. 8 Hiroshi Saito rows of mineralized teeth. Central tooth narrow, bicuspid; inner cusp much longer than outer one, weakly keeled at base, widening at top, with pointed at tip; outer cusp blunt at tip. Shaft of wide cutting edge. Centro-lateral (first lateral) major lateral with long petaloid process that is teeth lower than central tooth, with small acces- almost attaining near the tip of the inner cusp. sory plate at antero-dorsal corner, grooved at Major uncinus teeth with fairly wide cusp (Figs. inner surface. Major lateral (2nd lateral) teeth 16, 17). Figs. 12–17. Lepidozona alba n. sp., holotype, NSMT-Mo 78478. ― 12, Scales on perinotum. 13, Dorsal girdle margin. 14, Close up of dorsal girdle margin. 15, Spicules on hyponotum, inner surface. 16, Radula, anterior 16–20th rows. 17, Close up of central part of radula, anterior 10–12th rows. Scales: 100 μm for 12, 13, 15–17; 50 μm for 14. New Chiton from Okinawa Trough 9 Variation of valve sculpture. The three iso- (Tripoplax) cowani (Clark, 2008)] from a meth- lated intermediate valves exhibit considerable ane seep area off Conception, Chile, at the depth variation in the sculpture. Figure 10 shows a of 922 m (Schwabe and Sellanes, 2010). The valve with a very weak sculpture, some parts are present species also appears to live in a chemo- nearly smooth, whereas the valve in Figure synthetic environment, because all the specimens 11 has a coarser reticulate sculpture. The sculp- were collected together with a bivalve, Calypto- ture of the third, smallest valve is intermediate gena kawamurai which is characteristic to between other two valves. Rather irregularly chemosynthetic community. Okutani (2011) arranged longitudinal ribs with granular raises in described a new large lucinid bivalve, Elliptiolu- the sides of pleural areas and the flat radial ribs cina ingens from the same site with the present without granules are common features shared in paratypes, and suggested that it is associated with all specimens. In the smallest specimen (Fig. 3), a chemosynthetic environment. Further investi- the valve sculpture is much smoother than those gations are needed for both cases of chitons to of the larger specimen. Only a faint reticulation clarify their exact habitats and the relationships is found in the pleural areas. with the chemosynthetic communities. However, Etymology. alba, Latin, meaning white, for the it should be noted that three species of the same color of the animal. subgenus have been found in such environments. Remarks. Among species of the subgenus The deep-sea habitat of Tripoplax has been Tripoplax occurring in the Northwestern Pacific noted by Clark (2008).
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