西藏陆生贝类二新种(前鳃亚纲:中腹足目:环口螺科)  

TWO NEW SPECIES OF LAND SNAILS IN XIZANG AUTONOMOUS REGION, CHINA (PROSOBRANCHIA: MESOGASTROPODA: CYCLOPHORIDAE)

作　　者：陈德牛[1] 张国庆[1] 刘志霄[2] 

机构地区：[1]中国科学院动物研究所,北京100080 [2]新疆大学生物系,乌鲁木齐830046

出　　处：《动物分类学报》2001年第2期166-169,共4页Acta Zootaxonomica Sinica

基　　金：国家自然科学基金资助项目!(编号 39970 115 ) ;中国科学院分类区系学科发展特别支持费资助项目

摘　　要：记述中国西藏环口螺科 2新种 ,察隅褶口螺Ptychapomazayuensissp .nov .和下察隅倍唇螺Diplommatinaxiazayuensissp .nov .。对新种进行了描述 ,并与近似种进行了比较。In the present paper, two new species of Ptychapoma and Diplommatina ar e described. The materials studied were collected by auther from Xizang Autonomo u s Region, China, in 1980 and 1994. All type specimens are deposited in the Insti tute of Zoology, Chinese Academy of Sciences. Abstract In the present paper, two new species of Ptychapoma and Diplommatina ar e described. The materials studied were collected by auther from Xizang Autonomo u s Region, China, in 1980 and 1994. All type specimens are deposited in the Insti tute of Zoology, Chinese Academy of Sciences.1 Ptychapoma zayuensis sp. nov. (Figs. 1 3) Holotype alt. 7.64?mm, diam. 13.88?mm; diam of aperture 3.95?mm;diam of umbi lic us 4.89?mm , diam of operculum 3.32?mm, collected from Xiazayu Town (28 °04′ N, 97°E), Zayu County, Xizang Autonomous Region, China, 15 Jul. 1980. Paratypes 19 specimens, including 5 young snails, alt. 5.55 8.12?mm, diam. 11. 90 14 00?mm; diam of aperture 3.43 4.12?mm, diam of umbilicus 3.43 4.98?mm, diam of operculum 3 24 3 56?mm; collected with holotype, 15 Jul. 1994. Shell small, thick, lustre, flat conoid. Whorls 412, moderetel y convex, with low spiral part, body whorl very convex. Shells yellow brown in c olour, surface with very thin spiral line and growth line,and with some blacki sh brown arrow form streak, together with a clear thin blackish brown band at i t s periphery. Apex blunt, suture deep. Aperture circular, peristome thick, somewh at expanded and reflexed. Operculum cirrcular, cutin, yellow brown, thick, an d the inner surface has a papule form projection. Umbilicus big, deep. This new species closely resembles Ptychapoma bifrons (Hende, 1885), but differs from the latter by shells with 412 whorls (alt. 7.64 ?mm, diam. 13.88?mm) and with some blackish brown arrow form streak, togeth er w ith a clear thin blackish brown band at its periphery. In the latter species wit h 5 whorls, alt. 8 10?mm, diam. 12 14?mm, and peristome with du al lops, operculum without con

关 键 词：前鳃亚纲 中腹足目 环口螺科 褶口螺属 倍唇螺属 新种 西藏 陆生贝类 

分 类 号：Q959.212[生物学—动物学]