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南海南沙群岛永暑礁南永3井揭示了1 680年以来礁泻湖的沉积变化。沉积柱样主要由沉积遗壳组成,其中腹足类是最主要的类型之一。对该井88个样品分析共发现了159个种类和一些难以归入属种的胎壳,大多数种类为该海区首次记录的类型,有四个种是新发现的种类,即Astraea armata sp .nov .,Munditiella flammea sp .nov .,Serpulorbis spiralis sp .nov .,Cerithiopsis bellatulus sp .nov .,主要的优势种包括Acteocina coarctata , Ac-teocinaexilis , Alvania sp .,Boschitestella eloiseae , Cerithidium fusca , Cerithiopsis ingens , Cerithium( Therici-um) elegantulum, Circumstella biconcave , Clathrofenella reticulata , Diniatys dentifer , Granulina cotamago , Lophocochlias minutissi mus , Merelina wanawana , Omalogyra cf .atomus, Ondina elachisinoides , Orbitestella bermudezi , Orbitestella decorata , Plesiotrochus acutangulus , Retusa ( Ventomnestia) bizonata, Ringicula durodai ,Ringicula columnifera , Ringicula niinoi , Scissurella coronata , Tricoliavariabilis , Turbonilla eupellucida。这些种类个体非常微小,大多数小于2 mm。绝大多数种类为典型的热带海区分子,它们具有广泛的地理分布。本文按Okutani(2000)分类系统进行了分类,主要描述了仁螺目,古腹足目和盘足目共40个种的形态特征、地理分布和生态习性,包括2个新种,绝大多数种类系南沙群岛海区首次记录。
The South Yonghai Reef Nanyong 3 of the Nansha Islands in the South China Sea revealed the sedimentary changes of reef lagoons since 1 680 years. Sedimentary samples are mainly composed of sedimentary shells, of which gastropods are one of the most important types. A total of 159 species and some unidentifiable carcasses were identified from 88 samples of the well. Most of the samples were of the first recorded type in the area and four were newly discovered, Astraea armata sp. nov., Munditiella flammea sp. nov., Serpulorbis spiralis sp. nov., Cerithiopsis bellatulus sp. nov. The main dominant species include Acteocina coarctata, Ac-teocinaexilis, Alvania sp., Boschitestella eloiseae, Cerithidium fusca, Cerithiopsis ingens, Cerithium (Therici-um) elegantulum, Circumstella biconcave, Clathrofenella reticulata, Diniatys dentifer, Granulina cotamago, Lophocochlias minutissi mus, Merelina wanawana, Omalogyra cf.atomus, Ondina elachisinoides, Orbitestella bermudezi, Orbitestella decorata, Plesiotrochus acutangulus, Retusa (Ventomnestia) bizonata, Ringicula durodai, Ringicula columnifera, Ringicula niinoi, Scissurella coronata, Tricoliavariabilis, Turbonilla eupellucida. These kinds of individuals are very small, mostly less than 2 mm. The vast majority of these are typical tropical marine molecules that have a wide geographic distribution. According to the classification system of Okutani (2000), this paper mainly describes the morphological characteristics, geographical distribution and ecological habits of a total of 40 species, including 2 new species, Type of Nansha Islands sea area first recorded.