Descriptions of two species of Nassarius(Gastropoda:Nassariidae)from the South China Sea

Two new species belonging to genus Nassarius are described and illustrated based on shell morphology and radular features.Nassarius sanyaensis sp.nov.,collected from intertidal zone of Sanya,Hainan Island,China,most resembles Nassarius lyraeformis(Marrat,1880)in general shell shape,but differs from the latter in having remarkable nodules on shell surface.Nassarius beibuensis sp.nov.,sampled from shallow water of Beibu Gulf,is most similar to Nassarius oblongus(Marrat,1877),but can be distinguished from it mainly in having stronger sculpture.This study expands our knowledge of Nassarius diversity and distribution in China seas.

The radular morphology of Nassariidae (Gastropoda: Caenogastropoda) from China

The family Nassariidae includes a number of species that are distributed throughout the world. Each species has a characteristic shell shape, tooth shape, and behavior. However, the classification of species in this family of the Rhachiglossa is controversial. We describe the radulae of 22 species from China in detail using optical and scanning electron microscopy. These species are considered to be representatives of two subfamilies, two genera, and 10 subgenera. Our results suggest that the morphology of the central tooth and the pair of lateral teeth and the presence or absence of a pair of intermediate accessory lateral teeth could be used to distinguish among species. We found no support for the subgeneric differentiation of the species. However, the presence or absence of the intermediate lateral accessory plate was characteristic of species divisions. We noted sexual dimorphism in the shape of the teeth in some species, and considerable variability of the shape of teeth within a single species. Based on our results, the genus Nassarius cannot be split into subgenera using radula morphology.

A new species of Nassarius(Gastropoda:Nassariidae) from the western Pacific Ocean

This paper describes a new species of Nassarius from the South China Sea,which was recognized when re-sorting the collection of Nassariidae in the Marine Biological Museum,Chinese Academy of Sciences,Qingdao,China.The shells were collected during several investigations,including the National Comprehensive Oceanic Survey in 1958-1959,and the China-Vietnam Co-Investigation on Marine Resource of the Beibu Gulf during 1959-1962.The morphology of the shell and the radula places the new species of Nassarius within the subgenus Zeuxis.It is named Nassarius(Zeuxis) nanhaiensis sp.nov.

A new spceies of N assarius(Gastropoda,Nassariidae)from the northern China seas

A new species, Nassarius （Zeuxis） humeratus n. sp. of Nassariidae was described based on the specimens collected in the Huanghai Sea （Yellow Sea） and Bohai Sea during the expedition from 1958 to 1959. The new species was distinguished from similar species Nassarius （Zeuxis） bolangoi （Ladd, 1976） and Nassarius （Varicinassa） variciferus （A. Adams, 1852） in shell characteristics. Some relative discussion was provided. The new species mainly distributes in the subtidal zone of 30–53 m depth, in muddy and sandy bottom in the Bohai Sea and northern Huanghai Sea.

Descriptions of four new species of the genus Reticunassa Iredale,1936(Gastropoda:Nassariidae)from the northeastern coast of Taiwan Island and the South China Sea

In the present study,four new species of the genus Reticunassa Iredale,1936 collected from Chinese waters are described and illustrated.Reticunassa hugokooli sp.nov.,Reticunassa jungi sp.nov.and Reticunassa aureolineata sp.nov.were collected from the northeastern coast of Taiwan Island,whereas Reticunassa fuscofasciata sp.nov.was collected from the northeastern coast of Taiwan Island and the South China Sea.The four new species can be distinguished conchologically from other congeners mainly in protoconch,shell shape,sculpture,and coloration.These findings demonstrate that the biodiversity of this group in China might be largely underestimated.

中国近海卵织纹螺亚科的分类研究(腹足纲:织纹螺科)

卵织纹螺亚科(Cylleninae)隶属于腹足纲(Gastropoda)、织纹螺科(Nassariidae)。此亚科动物主要分布于热带印度-太平洋海区,通常栖息于潮间带至浅海的砂或泥沙质海底。以往中国对本亚科动物除一些零星报道外,缺乏系统的分类研究。作者利用传统的形态分类方法,对中国科学院海洋生物标本馆收藏的卵织纹螺科标本进行了系统的整理和分类,共鉴定出本亚科动物1属4种,其中1个未定种。文中对其形态特征、生活习性和地理分布进行了研究记述。