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Two New Species of the Family Liotiidae from South of Kyushu

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Two New Species of the Family Liotiidae from South of Kyushu The malaoologioalmalacological societysooiety of Japan 貝 雑 JaP． Jour． Malac ．（VENUS ） − Vo 且．36， No ．3 （1977〕 ： 99 102 原 著 Original Articles 奄 美 大 島 産 ヒ メ カ タ ベ ガ イ 科 の 2 新 種 櫻 井 欽 一 ・波 部 忠 重 Two New Species of the Family Liotiidae from ・ South of Kyushu Amami Oshima ， ’ Kin ichi SAKuRAI and Tadashige HABE 皿 useum Tokyo 160 （National Scienee ， ， Japan ） − （挿 図 Text −figs．1 4） 坂 下 泰 典 氏 か ら筆 者 等 に 査 定 の た め 送 附 さ れ た 奄 美 大 島 名 瀬産 の 貝 類 の 中 か ら ， ヒ メ カ ベ の で に の る タ ガ イ 科 の 2 新 種 を 発 見 し た 報 告 し ， 同 氏 感 謝 意 を 表 す 。 z そ の 1 種 ヒ ラ マ キ ヒ メ カ タ ベ ガ イ Cyclostrem α 丿砂 o 痂 o鰯 は こ の 属 の ロ 本 新 記 録 で あ ・ ル マ ヒ メ ベ saleashitai ＃Z で あ る り ，他 の 1 種 カ ザ グ カ タ ガ イ Pterarene l 新 属 新 種 。 Cyclostrema japonicum n ． sp ． ヒ ラ マ キ ヒ メ カ タ ベ ガ イ （新 称 ） 1 （第 ， 2 図 ） は の は で は み は 4 ， 胎 平 滑 ， そ 殻 小 形 ， 堅 固 ， 灰 褐 色 ， 平 巻 状 螺塔 多少 くぼ ，螺 層 層 殻 で は 15 で 8 り ， の に 後 の 螺 層 に は 多 く の 縦 肋 が 菊 目 状 に 現 わ れ る が ，次 体 層 ， 体 層 あ そ 問 い り の 上 に 密 に 多 少板 状 に 発 達 し た 成 長 脈 が あ る 。 ま た ，周 縁 に は 太 く強 螺肋 が あ ， そ 下 4 に て で い の の の 中 で 成 長 脈 も太 い 螺 肋 が 各 あ る が ，石 灰 が 全 面 沈着 し 明 か な D 螺 肋 問 溝 一 冂 は て て 太 い 肋 で 取 ら れ る 臍 孔 部 は く ぼ は 層 明 か と な る 。 殻 円 く 全 縁 ，厚 く 縦 張 縁 。 の の の で み ，そ の 縁 は 歯 型 状 に 刻 ま れ る が ，縦 肋 部 分 で 著 る し い 。 背 面 螺 塔 くぼ み も 縫 合 で で 歯 型 状 に 細 か く刻 ま れ る 。 臍 孔 は 広 く 開 き ，殻 頂 部 ま 見 え る 。 1．9mm 4・ 5 mm 3・3mm 立 殻 高 ， 殻 長 径 ， 殻短 径 （完 模 式 標 本 国 科 学 博 物 館 所 蔵 NSMT ・Mo 55338 ） 殻 高 1．7mm ， 殻 長 径 4． 3 mm ， 殻 短 径 3．7mm （副 模 式 標 本 桜 井 標 本 室 所 蔵 ） 一 殻 高 1．5mm ， 殻 長 径 4．2mm ， 殻 短 径 3・5mm （副 模 式 標 本 坂 ド泰 典 所 蔵） 模 式 産 地 ： 奄 美 大 島 名 瀬 附 記 ： こ の 属 の 既 知種 で は フ ィ リ ッ ピ ン 諸 島 セ ブ 島 か ら C ．kieneri（PHILIPPI，1858） が 知 ら れ て い る が ，殻 表 に 明 か な 格 子 目 の 彫 刻 が あ る 。 一 NII-ElectronicN 工 工 Eleotronio Library Service The malaoologioalmalacological societysooiety of Japan 】 00 VENUS ： Vo1．36， No ．3 （1977） ー Text ・figs 1− 1 2 Cyc ！ 窩 e ． 4． ， ． ostrema 知 加 癖 c 駕 n ．sp ． ピ ラ キ ヒ メ カ タ ベ ガ イ max ． diam ．4 ．5mm 3 Pterarene マ ， ， 4． saleashitai n ．gen ．＆ n ，sp ． ヵ ザ グ ル ヒ メ カ タ ベ ガ イ max ． diam ．10．5mm ． Pterarene sakashit α i n ． gen ． et n ． sp ． カ ザ グ ル マ ヒ メ カ タ ベ ガ イ （新 称 ） （at 3 ， 4 図 ） は ’ 穀 小形 ，自 色 ，堅 固 ， 平 巻 状 ，螺 塔 は 僅 か に く ぼ む ，螺 層 は 4 層 ，胎 殻 は ド滑 ， そ の の に は に に っ で に の 後 螺 層 密 板 状 な た 成 長 脈 あ り，周 縁 は 三 角形 平 な 翼状 突 起 が 出 て ， 体 で で 層 9 ，次 体 層 13あ る 。 縫 合 と 周 縁 の 問 に 稜 角 が あ る 。 体 層 で は 殻 口 に 近 づ く と結 節 が る た の に に 口 出 来 。 ま ，臍 孔 と 周 縁 間 も同 様 稜 角が あ り ，殻 に 近 づ く と 結 節 と な る 。 臍 孔 は の 広 く開 き ， そ 中 に 殻 頂 部 ま で 螺 層 が 見え る 。 ま た ，臍 孔 壁 は 歯 型 に 刻 ま れ ，体 層 で は 18 口 を 数 え る 。 殻 は 円 く て 全 縁 ，厚 く て 太 い 縦 張 肋 で 縁 取 られ て ，そ の 縁 は 弱 く刻 ま れ る 。 4・5mm 10． ． 殻 高 ， 殻 長 径 5mm ， 殻 短 径 9 9mm （完 模 式 標 本 国 立 科 学 博 物 館 所 蔵 NSMT −Mo 55339） 模 式 産 地 ： 奄 美 大 島 名 瀬 附 記 ： こ の 新 属 は ス キ ヒ メ カ タ ベ ガ イ 属 1）entarene （模 式 種 ： ス キ ヒ メ カ タ ベ ガ イ D ． sarcina IREDALE ， 1929 ） に 似 て い る が ，小形 で ， 螺 塔 は 平 巻 状 ，周 縁 の 突 起 は 2 列 で な で 口 の へ い い で く 1 列 あ り，殻 軸 唇 外 側 か ら臍 孔 内 延 び る 褶 を 欠 て る 点 異 な る 。 ’ C ！ノclostr θm α ？α poniczam n ． sp ． （Text −figs．1−2 ） small solid ashy spire Shell ， ， brown ， planorboid in shape with depressed and 一 NII-ElectronicN 工 工 Eleotronio Library Service The malacologicalsocietymalacological society of Japan HABE: Two New Species of Liotiidae 10t broad umbilieus. Whorls 4 in number. Itli turn of nuclear whorl smooth and glossy white. 8 axial variees on the body whorl and 15 on the penultimate whorl. Between varices the lamellate growth ]ines are densely set and covered by calcareous matter. Body whorl with a stout peripheral cord and 4 spiral eords on the upper and lower surfaees respectively, Umbilicus wide and deep, showing the upper whorls in it, crenulated by the varices and lamellate growth lines on its wall. Aperture circular. Peristome thickened by the heavy varix. Height 1.9mm, max. diam. 4.5mm, and min. 3.3mm (Holotype specimen preserved in the National Scienee Museum, NSMT-Mo 55338) Height 1.7 mm, max. diam. 4.3mm and min. diam. 3.7mm (Paratype speei- men preserved in the SAKuRAI Museum) Height 1.5 rnm, max. diam. 4.2 mm and min. diam. 3.5 mm (Paratype speci- men preserved in the SAKAsHITA Collection.) T･ype leca･lit?l.' Nase, Amami-Oshima, south of Kyushu. Re7narks: This new species closely resembles Cyciostrema･ a･mab･ile (DALL, 1899) from the At]antic coast of United States of Ameriea in shape, but that species has distinct tubereles en the periphery ef the body whorl. Cyel,ostre･m,a leieneri (PillLIp?I, 1858) from Cebu, Philippines, has cancellate sculpture on the surfaee of shell. This is the first reeerd of this genus in Japan. I'teraTene n. gen. Type speeies: Pterarene sakashitai n. sp. Shell small, white, so]id, planorboid in shape. Spire slightly concave. Umbilieus wide and deep. Whorls 4 in number. It2 turn of nuelear wherl smoeth and glossy. Surfaee covered with densely set lamellate growth lines. Peripheral keel of the body whorl with triangular, horizontal flat ridges, 9 on the body whorl and 13 on the penultimate whorl. Lamellae on the shou]der and basal keels gives granular appearance to the surface towards the aperture. Lamellate ridges on the body wherl create erenula,ted edge of the umbilieus. Aperture circular, thickened and expanded by the stout varix. Rema･rk･s: This new genus differs from the elosely allied genus Dentarene IREDALE, 1929 in having the small shell with the stellate peripheral keel instead of two spinous kee]s and without the fold running into the umbilicus from the outside of columellar margin. Pterarene sakashitai n. sp. (Text-figs. 3-4) Diagnosis as in the genus. Height･ 4.5 mm, max. diam. 10.5 mm and min. diam 9.9 mm (Holotype speci- men preserved in the National Scienee Museum, NSMT-Mo 55339) Type lecality: Nase, Amami-Oshima, south of Kyushu. NII-Electronic Library Service The malaoologioalmalacological societysooiety of Japan 102 VENUS ： VoL 36， No ．3 （1977） Literatures cited ・・’ ・ ． i e nt −a ． the western itia 27 ： ABBoTT R T 1950 ， The geDus Cyclost in Atlantic ， Johnso ，2 （ ） 193 −200 ． IREDALE T ．1929 η d molluscan notes No ．1． Mewt ． ｛eens 〜a ｝td Mt ｛s ． 9 ： ， ， Queensla Qz ， （3） − − 261 296 ， pls ．30 31， MooRE et aL 1960 Liotiinae in ： Treat ．Invert ．Paleont Mollusea − ， ． 1 1 ： 266 267． ， ， ， ， 1934 on the Liotd α and its allies Proc ！lc α d PILSBRY ， H ．A ．， ， Notes gastropod genus ． ． ． ・ Phila ； − Nat ．Sci． ．，85 （for 1933 ） 375 381 ， pl ．13． L 1843 Genus ‘： 〜α ． Icon ． 1− REEvE ， ， ， D lphi7zzt，Conch ，pls ． 5． − WENz ， W ．1938 ， 1．iotiinae in Handb ． der Palilozool． Gastropoda 2 ： 336 343 ． ， ， ， 雑 録 Bull． Zool ． ． 34 1 1977 動 物 命 名 規 約 ．委員 会 決 定 事 項 （ Nom ， （） ） Opinion 1079 ； カ ノ コ キ セ ワ タ ガ イ 属 ・49 ’μ 〃 RENIER ［11807〕及 び 模 式 種 A ． trit：olorat α RENIER 1807 1807 ． 〔 〕 を 有 効名 と す る 。 RENIER 〔 〕 の 著 作 は 命 名規 約 一L 無 効 と され た が ， こ の 属 名 は 広 く使 川 ． され て い る の で 規約 を 停 止 し て 有 効 と す る も の で ，従 っ て ， 科 名 Aglajidae PILsBRY ，1895 ヵ ノ コ キ セ ワ タ ガ イ 科 異 名 Doridiinae GRAY ，1847 ． 鱗 名 ∠4g ’αメα REMER 〔1807〕 カ ノ コ キ セ ワ タ ガ イ ．属 Doridium MECKEL 1809 異 名 ・ ， 1810 Ace 「a CUVIER ， と な る 。 ． lo85 ： Polycera LEMcHE 1929 opinion faeroensisの 命名者 を ， と す る 。 （波 部忠 重 ） 一 NII-ElectronicN 工 工 Eleotronio Library Service.
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