织纹螺科一新种记述(腹足纲,前鳃亚纲,新腹足目)

A NEW SPECIES OF NASSARIIDAE FROM ZHEJIANG PROVINCE,CHINA (GASTROPODA,PROSOBRANCHIA,NEOGASTROPODA)

在整理浙江沿海织纹螺科标本时,经传统方法和分子生物学方法鉴定发现1新种,即拟半褶织纹螺Nassarius(Zeuxis)semiplicatoides sp.nov.。隶属于腹足纲、新腹足目、织纹螺科、织纹螺属、Zeuxis亚属。文中对新种的形态特征和栖息环境进行了记述,并与近似种进行了比较讨论。

This paper deals with a new species of the family Nassariidae collected from Zhejiang Province.Type specimens are deposited in Malacology Lab.,Ningbo University,Zhejiang,China.Nassarius[ZK（1]（Zeuxis）semiplicatoides sp.nov.（Figs.1-2）Holotype,shell length 18.29mm,shell wide 8.14mm,registration No.NB20051125-01,Ningbo,Xianxiang（29°35＇N,121°50＇E）,muddy bottom,intertidal zone.25 Nov.2005,coll.ZHANG Ai-Ju.Paratypes 44 specimens,similar as holotype.Shell solid.Spire sculptured with close-set spiral ribs and prominent axial ribs except the apex.Shell yellowish brown,yellowish white or brownish cyan in colour,with purple brown bands,one on the postembryonic whorls,two on the penultimate and three on the body whorl,which banding is showing through in the aperture.Aperture is sub-oval,outer lip thick,strongly variced,interior with 11-13 elongate denticles.Anal canal distinct.Columella with a bordered columellar callus and irregular lirae.Operculum elongate oval,yellow,semitransparent,sometimes with denticulated margin.This species is common to abundant in tntertidal and subtidal sandy and muddy habits.They are more common in the East China Sea than in South China Sea,but they also can be seen along the coast of Shangdong and Jiangsu.It has a rachiglossan radula.The central tooth is multicuspidate with 12-13 cusps,the rachidian base is evenly and deeply notched along anterior edge.The inner and outer cusps of the lateral teeth are hookshaped.Generally,the lateral teeth are symmetrical（Fig.4）.But,in some cases,there is still another radula type.And the morphology of central tooth is the mainly different featrue.The central tooth of this radula type is multicuspidate with 19 cusps,and these cusps is slightnessed（Fig.3）.Generally,the new species is most similar as Nassarius（Zeuxis）semiplicatu than other species of Zeuxis,for they have the same whorl number,the similar shell colour and habit.But they are also different,the shell of new species is more elongate than N.（Z.）semiplicatus,and the axial ribs of N.（Z.）semiplicatus is always not obvious on the right side of its back side of body whorl.Although both of them have the similar habit and show schooling,they don＇t mix together.The radula of them is also different（Fig.5）.In addition,the phyligeny analysis shows that the phylogenetic relationship among this specie and N.（Z.）succinctus is closer than that among this species and N.（Z.）semiplicatus.