江西弯螺属一新种记述(肺螺亚纲,柄眼目,扭轴蜗牛科)

在整理江西地区陆生贝类标本时,经比对鉴定发现1新种,龙潭弯螺Sinoennea longtanensis sp.nov.,隶属肺螺亚纲、柄眼目、扭轴蜗牛科、弯螺属。对新种形态特征、栖息环境作了记述,并与其近似种进行讨论。

A NEW SPECIES OF THE GENUS SINOENNEA FROM JIANGXI, CHINA(PULMONATA, STYOMMATOPHORA, STREPTAXIDAE)

A new species of the genus Sinoennea is described in the present paper. The materials were collected in Jiangxi Province, China in 2011 by the authors. Type specimens are deposited in the College of Life Sciences and Food Engineering, Nanchang University, Nanchang and the Institute of Zoology, Chinese Academy of Sciences, Beijing, China. Sinoennea longtanensis sp. nov. (Figs 1-5) Holotype, alt. 3.50 mm, diam. 1.80 mm, alt. of aperture 1.24 mm, diam. of aperture 1.13 mm, collected from Longtan scenic spot, Jinggangshan City (26°35′N, 114°08′E), Jiangxi Province, China, 2 July 2011. Paratypes 9 specimens, alt. 3.24-3.60 mm, diam. 1.75-1.96 mm, alt. of aperture 1.00-1.29 mm, diam. of aperture 1.03-1.29 mm, collected with the holotype. Shell small, thick, solid, cylindrical. Apex blunt. Shell milk white or light yellow in colour, glassy transparent, with shining shell surface. Suture distinct and deep. Whorls 6 12, moderately convex with high spiral part. Top two whorls smooth, following ones with vertically, equally spaced ribs, about 26-27 on the last whorl, visible only at suture. Shell surface smooth thoroughly. Columella visible on the last whorl. Aperture small, triangle. Peristome thick, expanded and reflexed. Inner lip with callus and a big flake-shaped curving and angular lamella. Outer margin the peristome beard two nipple-formed palatal teeth: the smaller one lies at the upper edge of peristome, the large one deeper down at bottom of peristome. Columellar lip vertical, with two columellar teeth, one small nipple-formed tooth at the peristome edge, a second large nipple-formed tooth somewhat lower down. Basal tooth small. Umbilicus small, cavernous. The new species resembles Sinoennea pupoidea Zhou, Zhang and Chen, 2009, but differs from the latter by the shells with 6 1 2 whorls (alt. 3.50 mm, diam. 1.80 mm, alt of aperture 1.24 mm, diam. of aperture 1.13 mm) and the small, triangle-shaped aperture. At the columellar side there are two columellar teeth and one small basal tooth. But the latter shell with 5 1 2 whorls (alt. 2.94 mm, diam. 1.68 mm, alt of aperture 0.57 mm, diam. of aperture 0.57 mm) and small, elliptical-shaped aperture. At the columellar side there is one columellar tooth, without the small basal tooth. Etymology. The name of the new species is based on the type locality Longtan scenic spot, Jinggangshan City. Geographical distribution of Sinoennea longtanensis sp. nov. is showed in Fig. 6.