贵州沟螺属一新种记述(前鳃亚纲,中腹足目,环口螺科)  

A NEW SPECIES OF THE GENUS DIORYX BENSON FROM CHINA (PROSOBRANCHIA,MESOGASTROPODA,CYCLOPHORIDAE)

作　　者：罗泰昌[1] 张卫红[2] 周卫川[3] 

机构地区：[1]贵州师范大学生命科学学院,贵阳550001 [2]新疆大学生命科学与技术学院,乌鲁木齐830046 [3]福建省出入境检验检疫局,福州350001

出　　处：《动物分类学报》2009年第4期862-864,共3页Acta Zootaxonomica Sinica

基　　金：贵州省高校发展专项资金资助自然科学类重点科研项目(黔教科2004112);福建省自然科学基金项目(2009J0104)资助

摘　　要：在整理贵州省荔波县茂兰喀斯特森林自然保护区陆生贝类标本时,经鉴定发现1新种,即茂兰沟螺Dioryx maolanensis sp.nov.,文中对新种形态特征、栖息环境进行了描述,并对其相似种进行了分析和讨论。This paper deals with a new species of the genus Dioryx collected from Guizhou Province, China. Type specimens are deposited in the Institute of Zoology, Chinese Academy of Science, China.Dioryx maolanensis sp. nov.（Figs. 1-6）Holotype, alt. 5.16mm, diam. 4.16mm, diam. of aperture 1.33mm. Paratypes 6 specimens, alt. 4.50-5.33mm , diam. 3.5-5.16mm , diam. of aperture 1.00-1.67mm , collected from Maolan Town, Libo County （25°03′N, 108°00′E ）, Guizhou Province, China, 9 July 2001.Shell small, dextral, thick, globose conoid. Whorls 312, moderately convex, spire high, body whorl very convex. Shell yellowish in colour, worn specimens ashen-white, surface with very distinct vertically thin ribbed-line and growth line, protoconch smooth, without spiral line. Apex blunt. Suture deep, with a 0.83-1.00mm worm-form projection at suture of body whorl. Aperture circular, thick, with two lips, somewhat expanded and reflexed. Operculum circular, cuticular, yellow brown in colour, and the inner surface has papule-form projection, and concentric circles lines indistinct visible in the surface. Umbilicus small, crevice-formed. Jaw thin flake-shaped, transparent, the surface with scale-shaped structure. The radula tape-shaped, circular, with 1 central tooth, and with 7 smaller cusps on apex; 2 lateral teeth, and with 5 smaller cusps on apex; 2 marginal teeth,and with 4 smaller cusps on apex.This new species is similar to Dioryx ruyangensis Hu, Yin and Chen, 2004, but differs obviously from the latter in the small size; the shell with whorls 312, length 5.16mm, diam. 4.16mm; diam of aperture 1.33mm; surface of shell with very distinct vertically thin ribbed-line and growth line, with a 0.83-1.00mm worm-form projection at suture of body whorl. Jaw thin flake-shaped, transparent, the surface with scale-shaped structure. The radula tape-shaped, circular, with 1 central tooth, and with 7 smaller cusps on apex; 2 lateral teeth, and with 5 smaller cusps on apex; 2 marginal teeth,and with 4 smaller cusps on apex. The shell of t

关 键 词：前鳃亚纲 中腹足目 环口螺科 沟螺属 新种 

分 类 号：Q959[生物学—动物学]