摘要
作者在整理西藏陆生贝类标本中得双边凹螺属1新种,即察隅双边凹螺Chamalycaeu szayuensis sp.nov.,对新种进行了详细描述,并与近似种进行了比较。
In the present paper, a new spedes of the genus Chamalycaeus is described. The materials were collected by the authors in Tibet Autonomous Region, China in 1980. Type specimens are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Chamalycaeus zayuensis sp. nov. （Figs. 1-4）
Holotype, alt. 5.0 mm, diam. 3.57 mm, alt. of aperture 1.86 mtn, diam. of aperture 1.86 mm; collected from Tashan Town, Zayu County （28°04＇N, 97° E ）, Tibet Autonomous Region, China, 7 June 1980.
Paratypes 19 specimens, alt. 4.75-5.00mm, diam. 3.27-3.57 mm, alt. of aperture 1.68-1.86 mm, diam. of aperture 1.68-1.86 mm; collected from Tashan Town, Zayu County （28° 04＇ N, 97° E）, Tibet Autonomous Region, China, 26-27 May; 7-10 June; 3-13 July 1981.
Shell small, thin, subdepressed, semitransparent. Whorls 3 1/2-4 moderately convex, spire low, conoid, the body whorl descending in front. Shell surface yellowish brown in colour, the body whorl and the penultimate whorl with finely and somewhat regularly ribstriae, but the protoconch and second whorl without ribstriae, generally smooth, luster. Apex blunt, suture deep. The body whorl with a 0.86 mm long worm-form projection at the suntre 1.42 mm from the aperture. Aperture circular, thick, and somewhat expanded and reflexed, with a neck. Opcrculum drcular, sink, with a papule-form projection in the inner surface. Umbilicus wide, regularly widening. Radula with 1 central tooth, 1 lateral and 1 marginal tooth. The central tooth with 5 cusps, laterap tooth with 3-4 cusps, marginal tooth with 4 cusps.
The species closely resembles to Chamalycaeus rathouisianus （Heude, 1882）, but it differs from the latter by the shells with 3 1/2-4 whorls （alt. 5.0 mm, diam 3.57 mm, alt. of aperture 1.86 mm, diam. of aperture 1.86 mm）, the operculum is thick, not pellucid. Radula with 1 central tooth, 1 lateral and 1 marginal tooth. The central tooth with 5 cusps, laterap tooth with 3-4 cusps, marginal tooth with 4 cusps. The later sp
出处
《动物分类学报》
CSCD
北大核心
2008年第4期745-747,共3页
Acta Zootaxonomica Sinica
基金
福建省科技项目(2007I0001)
福建省闽港人才合作项目(2007)
国家科技基础性工作专项(2006FY111000-02)资助
关键词
腹足纲
前鳃亚纲
中腹足目
环口螺科
双边凹螺属
新种
Gastropoda, Prosobranchia, Mesogastropoda, Cyclophoridae, Chamalycaeus, new species.
