中国弯螺属一新种(肺螺亚纲,柄眼目,扭轴蜗牛科)

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

系统整理和研究了中国弯螺属的种类 ,共 10种 ,其中 1新种即茂兰弯螺Sinoenneamaolanensissp .nov .,弯螺属的种类主要分布于东亚和南亚地区 ;作者对其已发表的种类进行了整理、甄制 ,对新种的形态特征进行了详细描述 ,亦与近似种进行了比较。

The genus Sinoennea Kobelt belongs to family Streptaxidae. Its distribution range was limited in East-Asia and South-Asia. After rearrangment, the collection consists of total described as new to science. The type specimens are kept in the Institute of Zoology, Chinese Academy of Sciences.Sinoennea maolanensis sp. nov. (Figs.1-2) Holotype. Alt. 2.75?mm, diam. 1.75?mm; alt. of aperture 1.00 mm, diam. of aperture 0.63?mm; collected from Maolan Twon, Libo County (25°4′N, 107°8′E), Guizhou Province, China, 9 July 2001. Paratypes 4 specimens, alt. 2.38-2.88?mm, diam. 1.50-1.75?mm; alt of aperture 0.88-1.10?mm, diam. of aperture. 0.50-0.63?mm, collected with the holotype. Shell small, thick, solid, lustrous, cylindrical. Whorls 412, moderately convex with high spiral part. Shells light yellow or yellowish in colour, and with vertically some rib-stria, but except the protoconch and second without rib-stria, smooth. Apex blunt, ovate, with deep suture. Aperture small, long cylindrical. The peristome thick, expanded and reflexed, with 1 big flaky-form angular lamella at inner lip, with two big strong papillary teeth in right lip. The columellar lip and outer lip perfectly straight. Umbilicus wide, deep, cavernous. The new species very closely resembles Sinoennea larvula (Heude, 1882), but differs from the latter by the shells with 412 whorls, (2.75?mm, diam. 1.75?mm; diam. 1.31?mm) in the small size, with 1 big flaky-form angular lamella at inner lip, with two big strong papillary teeth in right lip. The latter shell big (alt. 3.5?mm, diam. 1.0?mm) and with one small wart-form tooth in right lip.