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Zr<Uthil1;Ltt}[I Ri-F* )Ifi Re$Iosrp The malacologicalsocietymalacological society of Japan Rrc VENUS (Jap, Joun Malac.) Vol. 48, No, 4 (198Y) : 223-230 iJNSM iEEM 0 pt., zr< ut Hil 1;Ltt }[i )b> C) pt ff 8 2i. 7t 7? ri- f* )if i re $iosrp fl tao 1 ;efpt ee ziAa* ･ ges fi* ･ es 7tsi ff** **betl:RF\ttMlt -) (*MSrkreJk# ･ v B A New Neritacean Limpet from a Hydrothermal Vent Site near Ogasawara Islands, Japan Takashi OKuTANI*, Hiroshi SAITo" and Jun HAsHIMOTO"" ('Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, Tokyo 108 and "* Japan Marine Scienee and Teehnology Center, Natsushima, Yokosuka 237) Abstract: A limpet eollected by the DSRV Shinkai-eOOO from a depth of 470m at a hydrothermal vent site in the Kaikata Seamount near Ogasawara Islands, Japan, represents a new taxon Shinkailepas kaikatensis, gen. et $p. nov., which belongs to the new Family Shinkailepadidae near the Family Phenaeolepadidae of the Neritacea (Archaeegastropoda). Introduction The recent rush of discoveries of new molluscan taxa from hydrothermal vent sites in the East Paeific has proved that these sites yield diverse new limpet species, genera, families and even superfamilies (McLean 1981, 1988a, 1988b, 1989). In contrast to this, the western Pacific gastropod fauna assoeiated with hydrothermal vents has not been well worked out up to this date, exeept a sole species, though not a limpet, Atviniconcha hessleri Okutani & Ohta, 1987. During one of the recent dives of the DSRV Shinkai-2000 of the Japan Marine Science and Techno]ogy Center in the waters near the Ogasawara (Bonin) Islands, an unusual limpet was discovered. This was not from a great depth but from the upper bathyal depth of 470 m on a western erator rirn of the Kaikata Caldera (KC Peak) central cone of the Kaikata Seamount (Fig. 1), The surroundings of the vents showed about on]y 100C higher than the environ- mental water temperature. It is worth noting here that this ]impet never accords with any of taxa created by the series of studies by McLean (op. cit.) on the East Pacific materials. On the basis of gross anatomy and observations on radula, it is decidedly a member of the littoral Superfamily Neritacea and warrants to represent a new species, new genus and new family to be deseribed in the following lines. NII-Electronic Library Service The malacologicalsocietymalacological society ofJapanof Japan 224 VENUS: VoL 48, No, 4 (1989) ';. o .T･･ 2/,o 14.,' 111' 142" 14s' Fig. 1, Index map of sampling site (a star). atM be,Et,E. (eEp) Materials Five specimens ranging from 4.4'mm to 9.1 mm in shell length eolleeted by the Dive 339 of the DSRV Shinhai-2000 on May 17, 1988, at 26042'32"E, 'to 141004'60"E, 470m deep. The specimens were all found attached besalt gravels eolleeted from this site. Hydrothermal vents were discovered in and around the above-mentioned locality. The water temperature near vents showed 220C representing about 10eC higher than the environment, The accompanied fauna ineludes Bythograeid crab, unidentified barnacle and Soleid fish (Hashi- moto et al. 1988). Taxonomy Superfamily NERITACEA Rafinesque, 1815 Family SHINKAILEPADIDAE nov. With characters of the genus Shinhailepas nov. Genus Shinkailepas nov. Diagnesis: Shell patelliform, with a narrow septa inside posteriorly; animal with a large oral lobe, penis on the right, and filamentous mantle papillae; 'type, operculum half calcareous and half corneous; radula of neritoid Type species: Shinkaitepas icaiicatensis n, sp. (O.D.) NII-Electronic Library Service The malacologicalsocietymalacological society ofJapanof Japan Okutani.Saite.Hashimoto; New Neritacean Limpet frem Hydrothermal Vent 225 Shinkailepas kaikatensis n. sp. (Figs. 2-8, 10-15) Speeimens exa?nined: Shell length Shell width Shell height (mm) (mm) (mm) Holotype (NSMT Mo-66230) 9.1 7.6 3.0 Paratype #1 (NSMT Mo-66231) 6.3 5.0 1.4 Paratype #2 (NSMT Mo-66232) 6.0 4.7 2.0 Paratype #3 (NSMT Mo-66233) 5.7 4.6 1.8 Paratype #4 (NSMT Mo-66234) 4.4 3.4 L2 Description: Shell low patelliform, whitish, with oval apertural outline, width about 80% of legnth, height about 30% of length, with posterierly inclined apex which is very weakly inclined to the right. Protoconch not visible as it is V7 il ･f 7 ･- 7'i h'd Figs.2-5. Shinkailepas kaikatensis gen. et sp, nov. (XTtsxtN) 2--4. Three views of the holotype specimen (9,1× 7.6 × 3.0mm). 5. Apical portion, enlarged. NII-Electronic Library Service The malacologicalsocietymalacological society of Japan 226 VENUS:Vol, 48, No.4 (1989) Figs.69. Radula (Scale bar:10 pm) twg 6-8. Shinkaitopas kaileatensis et sp. nov. Y7deI7*7'? gen, rfd (fiuaMpt) R, Rachidian tooth;IL-4L, lst te 4th lateral teeth; M, Marginals. 9. PhenacolePas sp. from Hachijo Island, it, =r }rVde'Itga)1ig (AS[seee) involuted, External surface whitish, with spaced, sharp radial ridges that are crossed by growth linespresenting somewhat granular appearance. In Paratypes 3 Nos. and 4, these radial ridges color exhibit grayish against white baekground. In Holotype, very region peripheral somewhat brim-like. Internal surface white, not with numerous pearly, punetuations in cavity. Narrow shelf-like septum with weakly arched rim present posteriorly. Inner wall immediately inside the aperture weakly thickened forming a IQw rim. Columellar muscle scar paired, elongate renal shaped, with length of about one-third the shell length. Very weak concentric threads and more present distinct adaperturally. Very weak radial threads also present, particularly apparent on the septum. Radula consisted of raehidian, 4 Iaterals and infinitive number of marginals, with the formula co: 4:1:4:co. Rachidian tooth subquadrate, than wide, longer widened a little in the middle, with no cusp on top, but with transversal blunt ridges on top and in the middle resulting a shallow hellow below them. First lateral transversely elongate, razor-blade like in shape, with strong distal constriction. Roof also undulatillg overhanging downwards distally eoming ¢ lose tQ twisted and upturned distal NII-Electronic Library Service The malacologicalsocletyofmalacological society of Japan Okutani.Saito.Hashimoto: New Neritacean Limpet from Hydrothermal Vent 227 p Px1[ ol .h- (- ",,[ xfi - ct ).Xf:L .iu.zt -e '.ltrrf tt, <! mY ) .'c '"' , k f L ' ol x s. tt T･･., ps ,L' -.": 's '1 K, .,; Ts'?l, '' lf / - y. m'i ,!ssFA;E)22 ' I .Ettv7'c' 'F. ':" 1 11 't.'s 't' co r[- ,cr-y t 1･ srn li/ff''f 'j iZ c / ts' xt' utt".t4 N, -t--sm ･ ,,) tt ditieij ' ., ' --tz, .t / .. I J'tt ( ,t t' t, 1 / Iig7t 'tl... k thtttttt t ttxmp x t 'T. !- x )'/JvU-V 'i"vh' '' ' f 't'","P' '.'r,L( )..'tsN' :- x' x ho h ,: 1 ppp .{,.t.. "" 12 ;t 10 I i mg i' 1 at mp---xl mo /x , v 1 x .t '/- p ol '?i{I rn 'J.).ttt/ f)z ' a li'J .Cl-,( vPs f '''tt' .] .ttk'x"c ' N tt- ttt .t' pp vm )?- {:ttt' '14 15 Figs. 10-15. Shinkailapas kaikatensis gen. et sp. nov. (Scaie bar: lmm) v7rb l7*7?ff rf (kuzsump) 10. Dersal view, shell and anterior part of mantle removed (Holotype). 11, Cephalic part, ventral view of the same, 12, Operculum in situ (Paratype No. 1). 13. Cephalic part, right side, dorsal view (Holotype). 14. Ventral view (Paratype No. 1). 15. Alirnentary tract of the same. Letters: a, anus;bm, buccal mass;c, ctenidium;co, calcareous part of operculum;ct, cephalic tentacle;e, eye; f, foot;h, position of heart;ho, horny part of operculum;i, intestine;k, kidney ; m, mantle ; mg, niidgut gland ; mo, mouth ; mp, mantle papilla ; o, oesophagus ; ol, Dral lobe;p, penis;pp, pedal papilla;ps, pedal sole;rs, radular sac;s, stomach;sm, shell musc!e; ym, ventral mantle, NII-Electronic Library Service The malacologicalsocietymalacological society of Japan 228 VENUS: VoL 48, No.4(1989) portion of the blade. No cusp present on the lst lateral. Second lateral far smaller than the former, rather triangular in shape with strongly incurved top which earries 4-5 sharply pointed, radiating cusps. Third lateral hook-shaped in frontal view, with minute serration along the upper edge. Expansion behind forms flexure fused together with the 2nd lateral on which a part of expansion overlies. Base elongated, tusk-like in shape. Fourth lateral triangular in general but with an unusual swelling behind. Roof rather narrow, with 4 distinct cusps gradually decreasing in size distally. Base elongate, tusk-shaped or conic, slightly recurved. Marginals all with forked top with 5-6 slender and sharp cusps and with a tusk-shaped base. Animal reddish when fresh, but fainted to opaque fleshy in color in preserved condition. Dorsal side lew, conically elevated with no sign of coiling. A pair 'thin, of elongate, renal shell muscles apparent on both sides dersally. Mantle fleshy, with numerous filamentous papillae along and immediately above margins, 'the Head rather wide, with short, conical cephalic tentaeles and small eyes near base. Penis short, conical, with a probable seminal groove in fTollt, situated on the right below tentacle. Oral lobe very massive. Foot oval, with digitate processes or papillae along posterior edge of postpodium, on whieh operculum lies. Operculum very thin and small, subquadrate in front and round behind. Posterior half corneous, transparent, but the anterior half ealcareous and opaque. Buccal mass large, with long radular sae postero-dorsally. Intestine ollce runs ahead and then behind, Stomach smalL Ctenidium* relatively large, reaching to the posterior part of the head. 'bhe Remarks: This taxon has charaeters that warrant to place it within Super- famiJy Neritacea, sueh as pessession of septa, quadrate opereulum which has a ealcareous portion and Neritoid-type radula. The morphology of radula exhibits a strong similarity to the dentition of the genus Phenacolepas (Phena- colepadidae) (Fig.
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