莽山陆生贝类一新种(前鳃亚纲,中腹足目,环口螺科)

A NEW SPECIES OF LAND SNAIL FROM MANGSHAN, HUNAN PROVINCE, CHINA(PROSOBRANCHIA, MESOGASTROPODA, CYCLOPHORIDAE)

笔者于 2 0 0 1年 5～ 9月在湖南莽山自然保护区进行陆生贝类多样性调查 ,获得陆生贝类标本一批 ,经鉴定发现 1新种 ,即莽山倍唇螺Diplommatinamangshanensissp .nov .,其隶属于腹足纲、前鳃亚纲、中腹足目、环口螺科、倍唇螺属。对新种形态特征、栖息环境进行了详细记述 。

This paper describes a new species of Cyclophoridae collected from Mangshan Mountain Hunan Province, China. Type specimens are deposited in the Institute of Zoology,Chinese Academy of Sciences.Diplommatina mangshanensis sp. nov.(Figs.1-2) Holotype alt 3.00?mm, diam. 1.75?mm; alt. of aperture 0.88?mm, diam. of aperture 1.00?mm; collected from Mangshan(24°9′N, 112°8′E), Hunan Province, China.10 Sep. 2001. Paratypes 9,6 of which are young snails, alt. 2.75-3.00?mm, diam. 1.50-1.75?mm; alt. of aperture 0.75-1.13?mm, diam. of aperture 0.63-1.03?mm; collected with holotype, 10 Sep. 2001. Shell small, slightly thick, transparent, lustrous, pupa-formed. Whorls 512, moderately convex, with high spiral part, the primordial 1-2 whorls very convex. Apex blunt, the protoconch (1-112 whorls) smooth, suture deep. The shell surface light yellowish brown, and with somewhat regularly oblique rib-stria. Aperture elliptical, thick, somewhat expanded and rather broadly reflex and with a small columellar margin tooth. The inner lip closes on the last whorl, and with very a thin crack-shape on the inner lip centrica. Operculum circular, cuticular, translucent, light yellowish brown. Umbilicus small, crack-formed. This new species closely resembles Diplommatina xiaoqikongensis Ran and Chen, 1999, but differs from the latter in reaching larger size: alt 3.00?mm, diam. 1.75?mm; alt. of aperture 0.88?mm, diam. of aperture 1.00?mm, 5 12whorls, The inner lip closes on the last whorl, and there is a very thin crack-shape on the inner lip centrica. The shell of the latter species is smaller, with alt 2.00-2.50?mm, diam. 1.00-1.33?mm; alt. of aperture 0.67-0.78?mm, diam. of aperture 0.67-0.83?mm, 6 whorls, without very thin crack-shape at inner lip centrica.