The malacologicalsocietymalacological society ofJapanof Japan VENUS (Jap, Jour. Maluc,) H# Vol. 58, No.4 (l999}: 175-190 New Species of the Pyramidellidae (Orthogastropoda: Heterobranchia) from the Collections of the Yamaguchi Museum and the Hagi City Museum Shigeo HoRi and HiroshiFuKuDA Y'okyoUniversib ] cif Fisheries, 4-5-7, Kbnan, Minato-ku, 7?)k.yo 108-8477 and Department of rvatural History, 7bkyo Metropotitan University, Hktchioji, 7bkyo 192-0397 Abstract: During detailed examination of unidentified specimens of the Pyramidellidae in the Yamaguchi Museum and the Hagi City Museum, nine hiLherto undescribed species were rec- ognized, and here described as new: Ondina etachisinoides, Chr:v:sallida stmpa, Trabecuta trun- catettijbrmis, EgiXina kotoeae, Ettlimella toshikazui, Turbonilla kuraenohamana, 71 gtori- ami.yhimana, Pyrlgisc"s }:oshikoae and foshishigea choshuana. A new genus, }'bshishigea is also elected. Keywords: Pyrnmidellidae, new gcnus, speeies, taxonomy, Hagi City Museum, Yamaguchi Museum, Yamaguchi Prefecture.new Introduction The and the mude major contributions to Yamaguchi Museum Hagi CityMuseum have bQth malacology in Yamaguchi Prefecture, The Yamaguchi Museum, Yamaguchi City, has in its collec- tiuns a large number of molluscan specimens from all over the Prefecture, including the collection donated by the late Mr, Takusuke Kawamoto, and is said to be one of the most important facilities for overviewing the molluscan fauna ef the Prefecture, Hori & Tsuchlda (1989, 1990), H. Fukuda et al. (1990), and Tsuchida & Hori (1990) carcfully examined and presented revisional reports on the Pyramidellidae in the Yamaguchi Museum, institutionfor malacology in northern Yamaguchi Thc Hagi City Museum is the central Prefecture. It contains a large number of molluscan spccimens t'rom the region, mainly collected by the ]ate Messrs. Yoshishige Ikeda and Takeichi Tada, and the pyramidellids in its collectiQns were revised in dctail by Hori (1996). Fellowing the examinations of the two museum collections detailed above, many specimens of the Pyramidellidae remained unidcntified. The present authors recently carTied out morphological re-examination of these specimens in detail, with several of them turning eut to belong tQ unde- scribed species. Onc of the present new species (Ondina etachisinoides) is here described with Mr. Hiroshi Yoshizaki, IhonoshD, Yanai, Yamaguchi Prefecture, Japan. Materialsand methods All shells were observed and photographed with stereonticroscopes (Nikon SM-Z; WILD M400) and a scanning electronic microscope (JSM-5200LV). Abbreviations: D: shcll diameter (mm); H: Shell height (mm); HCM: Hagi City Museum, Emukai 525-4, Hagi 758-O041, Yamaguchi Prefecture. Japan; SEM: scanning electronic microscope; YMZ: Yamaguchi Museum (Zoology), Kasuga-ch6, 8-2, Yarnaguchi 753-O073, Yamaguchi Prefecture, Japan. NII-Electronic Library Service The malacologicalsocietymalacological society of Japan 176 VENUSi Vo]. 58, No.4 (1999) Ihxonomy Superfamily Pyramidelloidea Gray, 1840 FttmilyPyramidellidaeGray, 1840 Genus Ondina Dc Folin, t870 71}pe speciesi Ondina semiornata De Folin, 1872, by monotypy. Ondina elachisinoides Hori, H, Fukuda & Yoshizaki, n. sp. (Figs. 1-3) 71>pe materials: 26 specimens. Holotype YMZ-Mo 6019: H 1.22, D O.70, Kiyogahama Beach, Abu-ch6, Abu-gun, Yamaguchi Pref. (beach drift), Oct. 1, 1992, coll. by S. Hori; two paratypes HCM-Mo 2723: ditto. Dec. 30, l992, coll. by S. Hori; fbur paratypcs HCM-Mo 2724: ca. 10 m A deep, off Kiwado Heki-ch6, Otsu-gun, Yamaguchi Pref. (shelly sand piled in octopus traps), May 2, 1993, coll. by S, Hori; 17 paratypes YMZ-Mo 6020: off Kuwabara, Tokuyama City, Yamaguchi Pref. (shell sand pi]ed in octopus pots), Jan. 3, 1990, cell. by T. Sasaki; two paratypes YMZ-Mo 6021: off 6mishima Island, Ehime Pref., western Japan (sand brought to the Southern Seto Ihonosh6 Marinc Park, ]honosh6, Yanai City, Yamaguchi Pref.), Jan. 13, 1996, by H. Yoshizaki. Description: Shell ovate, moderately thick, lustrous, and translucently white. Protoconch (Fig. 3) of at least 1.5 whorls, diametcr 250 ptm, translucent, smooth; proteconch heterostrophic at an angle ef ca. 160- to teleeconch axis; 50-55% of protoconch subsumed in first teleoconch whorl, with earliest portion completely concealed. Teleoconch of 2.6 whorls, slightly convex-sided, Suture distinct, slightly tabulatc immediately abapically. Growth lines opisthocline, flexed forward (i.e. ventrally). Teleoconch sculpture of thin spirat grooves on abapical portion of each whorl; two grooves en penultimate whorls and ca, 1O on body whorl including base; grooves become feebler toward umbilicul region, Body whorl 74% of shel] height; periphery and base convex. Aperture 45% of shell height, ovate. Co]umella thick, concave. Single columellar fold on posteriormost part of celumella, oblique to co]umellar axis; rclatively smal1 but distinct. Inner lip covered with a thick callus. Outer lip modcrately thick with a shallow sinus at abapicalmost part. Palatal sculpture absent. Umbilicus widely epen. 71ype locality: Kiyogahama Bcach, Abu-ch6, Abu-gun, Yamaguchi Prefecture (34031'44"N, 131020'4S"E). Etymolog),: Elacrhisina (Latin): a genus of the family Elachishinidac; -oides (I.atin): similar, like. The present species is namcd for its similarity in shell appearance with Etac'hisina (e.g. E. ziczac H. Fukuda & Ekawa, 1997). Remarksi Ondina etachisinoides resembtes Odvstomia (Jordanula) megembtl},on Saurin (1958: p. 70, pl. 1, fig. 7) from South Vietnam, but differs from the latter in lacking a distinct narrow spi- ral groove on the periphery. Ondina etachisinoides can also be distinguished from Odostomia (J.) sulcatetla Corgan & van Aartsen, 199S (Saurin, 1959: p. 240, pl, 3, fig. 26, as Odostomia (J.) in.fin- sulcata Saurin, 1959) from Victnam by its broader shell (DIHi O.57 in specimen with 2.6 whorls vs. O,4t in specimen with four whorls). The species is in the present placed gcnus Ondina by virtue of its ovate shell, opisthocline growth lines, and spiral grooves on the base, all common features with the type species Ondina semiornata De Folin, 1872. Here the nominal species belonging to Ondina is recerded from Japan fbr the first time, Although H. Fukuda (1995) recorded a congeneric species from the Ogasawara Islands, it was an unidentified one. NII-Electronic Library Service The malacologicalsocietymalacological society of Japan Hnri & Fukuda: New Speeies ol' PyraTnidellidae from Yamaguchi and Hagi Muscums 177 Genus Chr[ysattidaCarpenter, 1856 Txpe species: Chemnitzia communis C. B, Adarns, 1852; by original designation. tht:ysatlitla stttpa n. sp. (Figs. 4-8) Tokuyama Bay, 71},pe materials: Seven specimens. Holotype YMZ-Mo 3282: H 3.40, D 1.55. Yamaguchi Pref., eoll. by Takusuke Kawamoto; six paratypes YMZ-Mo 6022: off Kuwabara. Tokuyama City, Yamaguchi Pref. (shelly sand piled in octopus traps), Jan. 3, 1990, coll. by Takenori Sasaki. Description: Shell conical, thick, slightly lustreus, and opaquc white, Protoconch (Figs 6, 7) of ca. 1.5 whor]s, diameter 240 ptm, slightly translucent white, smooth; protoconch heterostrophic at angle of ca, 1 20" to teleoconch axis; ca. 30-35 % of protoconeh subsumed in fi rst teleoconch whorl, with earliest portion slightly exposed (Fig, 6). Teleoconch of 5.5 whorls, almost straight-sided. Suture distinct, slightly tabulate immediately abapically. Growth lines fine, prosocline, Teleoconch sculpture of conspicuous spiral cords, three in number on euch whorl; abapical cord broader than adapical other two on evcry whorl; adapical twe cords on lst to 3rd teleeconch whorl clearly gran- ulose (Fig. 8); a part of additional cord appears on suprasutural part of 3rd teleoconch whorl and penultimate whorl. Interspaces of spiral cords distinct, width about half of that of adapicalmost cord on every whorl; interspaces sculptured with thin axial lirae. Body whorl 56 % of shell height; periphery convex, Periphcry of body whorl encircled by peripheral and subperipheral spiral cords; peripheral cord as wide as 3rd cord on body whorl; subperipheral cord as wide as 2nd cord on body whorl, Umbilical area with no spiral cerd, Aperture 35 % of she]1 height, ovate. Columella thick, slightly concave. Single columellar.fold on posteriorniost part of columella; oblique to columellar axis; distinct, moderately developed. Inner lip covered with a thin callus. Outer lip moderately thick. Palata] sculpture absent. Umbilicus extremely narrow. 7ype tocality: Tokuyama Bay, Yamaguchi Prefecture (about 34"OO'N, 131"45'E), Et);moiogy: Stupa (Sanskrit): a buddhist monument. The present species is named for its partly granulose pyramidellid spire which resembles the buddhist monument. Remarks: Chtlysattida st"pa resembles Miratda gemma (A. Adams, 1863) (Dall & Bartsch, 1906: pp. 356-357, pl. 22, t'ig, 1) from Japan and M. scopulorum (Watson, 1889: p. 485, pl. 31, fig. 5) from Hawaii and northwest Pacific, but it differs from the both in having spiral cords which are granulose only on adapical whorls. The present species is placed in thc genus Chtlysallida, by virtue ofits conical shell with strong axial and spiral ribs, of which the axial ones pass only faintly over the base while the spiral ones remains quite prominent, as in the type species Chtlysallida crommttnis (C. B. Adams, 1852). Genus 7}"abec"la Monterosato, 1884 Txpe species: Ttahecuta J'eXfreysiana Monterosato, 1884, bymonotypy. 7}rabecula truncatellijbrmis n. sp. (Figs. 9-12) Four specimens, Kiyogahama 71ype materials: Holotype YMZ-MQ 6023: H 1.737coll.D O.80. Beach, Abu-ch6,