摘要
作者从吉林省盘石县红南林场采得环口螺科一新种:盘石双边凹螺 Chamalycaeus panshiensis,本文对该新种的形态特征作了详细描述,尤其对齿舌作了显微观察,其齿式为(2:1:1:1:2)/57。作者并与近似种拉氏双边凹螺 Chamalycaeus rathouisianus(Heude,1882)进行了比较。
In the present paper, a new species of opcrculated land snail is described. The material studied were collected by Mr. Cheng Ji-min from Panshi County, Jilin Province, China, in July 6, 1985. Type specimens are deposited in the Institute of Zoology, Academia Sinica.Chamalycaeus panshiensis sp. nov. (figs. 1-6)Holotype: Alt. 3.3mm., diam. 4.7 mm., Operculum diam. 1.3mm; collected from Hongn-an forestry centre, Panshi County (43°15'N, 126°10'E), Jilin Province, China, July 6,1985.Paratype: 47 spceimens. Alt. 2.7-3.5 mm., diam. 4.1-5.2 mm., collected with the holotype.Shell small, thin subdepressed, semitransparent. Whorls 4-41/2, moderately convex, spire low, concid, the last narrowly rounded peripherally, and deeply descending in front, with deep suture, nearly lusterless except the protoconch and second, surface very finely and somewhat regularly rib-striatedaxially, and the protoconch and second without lustre, generally smooth and with a projection as wormform at the suture of body whorls. Shells yellowish brown or lorn-yellowish brown in colour. Umbilicus wide, regularly widening, showing the earlier whorls inside; Apertare circular, thick, with two lops, and somewhat expanded and reflcxcd. Operculum circular, sink, but the inner surface has a papule-form projection. Radula with 1 central tooth, 1 lateral and 2 marginal teeth, except the marginal teeth, the central and lateral teeth with ectocones, but the marginal tooth with a hook.This new species very closely resembles Chamalycaeus rathouisianus (Heude, 1882), but differs from the latter by the shells with 4-41/2 whorls, (alt. 3.3 mm, diam. 4.7 mm.,) in the larger size, having 57 rows of radular teeth (each row being provided with 1 central tooth, 1 lateral tnd 2 marginal teeth) except the marginal teeth, the central and lateral teeth with ectocones. The operculum thick, lustre, no pellucid.
出处
《动物分类学报》
CSCD
1989年第2期157-159,共3页
Acta Zootaxonomica Sinica
关键词
环口螺科
双边凹螺属
新种
Gastropoda Prosobranchia Mesogastropoda Cyclophoridae Chamaly-caeus new species
