东海蛾螺属二新记录种(腹足纲,蛾螺科)

在整理近年来东海采集的蛾螺科Buccinidae标本时,鉴定出属于蛾螺属Buccinum Linnaeus,1758的两个中国新记录种:(1)白肋蛾螺Buccinum leucostoma Lischke,1872,采自于东海300—400m深的泥沙质海底;(2)古式蛾螺Buccinum koshikinum Okutani,1988采自于东海400m深的泥沙质海底。文中分别对这两个新记录种的形态特征、生活习性等进行了描述,并与相似种进行了分类学讨论。此外,文中还列出了中国海已报道的其他蛾螺属种类。     

南海蜑螺科一新记录属和一新记录种记述 (软体动物门:腹足纲:珍珠蜑螺目)

作者在整理中国科学院海洋生物标本馆馆藏蜑螺科Neritidae标本时,鉴定出产自海南三亚的一新记录属饰纹蜑螺属Vittina Baker,1924和一新记录种：裂蜑螺Vittina pennata（von Born,1778）。文中详细描述了本种的贝壳形态特征,查明了其生活习性和地理分布特点,并与相似种进行了比较和总结。     

Two new species of Naticidae (Mollusca, Gastropoda) from the coast of China

Two new species of Naticidae （ Mollusca, Gastropoda） collected from the coast of China are described： Cryptonaitca huanghaien- s/s sp. nov. and Sinum vittatum sp. nov. The morphological characteristics between the new species were described and the related information was provided. The similarities and differences between the new species and related species were also compared and discussed. The new species Cryptonaitca huanghaiensis differed from Cryptonaitca hirasei and Cryptonaitca andoi in outer shape, operculum and radula. The new species Sinum vittatum is similar to Sinumjaponicum （Lischke, 1869）, but the shell of the former is flat-elliptical in shape, spire very small, slightly convex. While the latter is flat-globular in shape, apex light brown in color, without a brown band on the body whorl. The comparison results revealed that Cryptonaitca huanghaiensis and Sinum vittatum were two new species from the coast of China. Specimens studied were obtained from collections in the Marine Biological Museum, Chinese Academy of Sciences.     

中国近海蛾螺科(Gastropoda: Buccinidae)种类齿舌的扫描电镜观察

本研究选取了中国近海蛾螺科动物16属,共计21种,进行了齿舌解剖,利用扫描电子显微镜对齿舌进行了观察,并对其形态特征进行了研究对比。结果证明,蛾螺科种类的齿舌齿式为1·1·1。通过研究发现蛾螺科动物的齿舌形态结构包括形状、排列方式以及齿尖数目虽然在属内、种内有一定的变化,但仍可以作为蛾螺科种类的分类依据之一,从而将各属、种区分开来。此外,本研究确认了在火红土产螺Pisania ignea(Gmelin,1791)中存在着齿舌两性异型现象。     

中国近海核果螺属和小核螺属(腹足纲,骨螺科,红螺亚科)的分类研究

核果螺属(Drupa)和小核果螺属(Drupella),隶属于骨螺科(Muricidae)、红螺亚科(Rapaninae)。它们为暖水性较强的热带种类,主要分布于南中国海(海南岛以南),栖息于潮间带至浅海珊瑚礁或岩礁质环境中。对中国科学院海洋生物标本馆收藏的骨螺科标本进行了整理分类,共鉴定出2属,7种。并对以往使用混乱的种名进行了修订。     

Bioerosion on Late Pleistocene Marine Mollusks: A Paleoclimatological and Paleoecological Comparison of MIS 7 and MIS 5e with Modern Beaches (Río Negro, Argentina)

The Late Pleistocene littoral ridges of southern South America, especially those of the north of Argentinean Patagonia, contain remains of mollusk shells with bioerosion traces. Eleven sites from marine isotope stages (2 from MIS 7, 4 from MIS 5e) and five sites from modern beaches from northern Río Negro Province, with 40 taxa (17 bivalves and 23 gastropods) were analyzed, in the area between west of Baliza San Matías and Las Grutas (41°S). Three ichnogenera were identified in deposits of MIS 7: Entobia, Gastrochaenolites (Domichnia) and Oichnus (Praedichnia) with one ichnospecies (G. torpedo). Six ichnogenera were identified in deposits of MIS 5e: Entobia, Meandropolydora, Pinaceocladichnus, Iramena, Caulostrepsis and Oichnus with one ichnospecies (O. simplex). Seven ichnogenera were identified from modern beaches: Entobia, Meandropolydora, Iramena, Caulostrepsis, Pinaceocladichnus, Gastrochaenolites (Domichnia) and Oichnus (Praedicnia), with two ichnospecies (O. simplex and O. paraboloides). On this basis, it is inferred that Pleistocene benthic communities were constituted from cheilostome bryzoans and polychaete annelids, together with drilling bivalves, predatory gastropods and overall warm-water species of mollusks. Of these, Chama iudicai was found on Plicatula gibbosa from MIS 7 and MIS 5e. The record of warm temperature species suggests a higher sea surface temperature (SST) than the present one and/or the influence of the warm southward Brazilian Current affecting the waters of Golfo San Matías. On the modern beaches surveyed, there is an increase in polychaete annelids, cheilostome bryzoans, temperate-cold species and drilling bivalves, as well as sandy substrate species, which together with an increase of Gastrochaenolites and Caulostrepsis, suggest a colder climate due to the greater influence of the Malvinas Current during the Holocene.     

Comparative phylogeography and population genetic structure of three widespread mollusc species in the Mediterranean and near Atlantic

Although several studies have evaluated the genetic structure and phylogeographic patterns in many species of marine invertebrates, a general model that applies to all of them remains elusive. For example, some species present an admixture of populations with high gene flow, whereas others exhibit more complex patterns characterized by small‐scale unstructured genetic heterogeneity, even at a local scale. These differences are thought to be due to clear biological aspects such as direct versus indirect development, or the presence of lecithotrophic versus planktotrophic larvae, but few studies compare animals with similar distributions and life modes. Here, we explore the phylogeographic and genetic structure patterns in two chiton (Chiton olivaceus and Lepidopleurus cajetanus) and one abalone (Haliotis tuberculata) species co‐occurring in the same habitat. Samples were obtained from shallow rocky bottoms along the Iberian Peninsula (Atlantic and Mediterranean coasts), Italy, Croatia and Greece, and the mitochondrial markers COI and 16S rRNA gene were sequenced. Our data show evidence of admixture and population expansion in C. olivaceus and H. tuberculata, whereas L. cajetanus exhibited a ‘chaotic patchiness’ pattern defined by a high genetic variability with locality‐exclusive haplotypes, high genetic divergence, and a lack of geographic structure. Shared haplotypes were sampled in both coasts of Iberia (for H. tuberculata) and in the Western and Eastern Mediterranean (for C. olivaceus), potentially indicating high dispersal ability and a recent expansion. The processes underlying the fine‐scale structuring in L. cajetanus remain a mystery. These results are especially interesting because the reproductive mode of the two chitons is similar but differs from that of the abalone, with a veliger larva, while instead the genetic structure of C. olivaceus and H. tuberculata are similar, thus contrasting with predictions based on the life history of the three molluscs and showing that the genetic patterns of marine species may be shaped by many factors, including historical ones.     

A survey of the non-marine Cretaceous in China

A review of the stratigraphy of the continental Cretaceous sequences is given. Conchastracans, ostracods and charophytes have proved useful in biostratigraphy, with additional aid from pelecypods, gastropods, larger plant fossil and, locally, dinosaur remains.The continental Lower Cretaceous deposits are considered to fall into three domains: the Circum-Pacific, the Tethyan and the NW Chinese. The continental Upper Cretaceous sediments occur mainly in the three domains: NW Chinese, SE Chinese and NE Chinese.     

阿达滩盆地古近纪淡水腹足类化石的发现及其地质意义

东昆仑西段阿达滩盆地早新生代陆相碎屑岩沉积建造，原先被笼统认为属“下第三系”。1：25万库郎米其提幅区调中，在该碎屑岩建造中首次发现淡水腹足类化石：假菊石型南方圆螺黄河亚种Australorbis pseudoammonius huanghoensis Yu，实椎螺(未定种)Lymneasp．根据含化石地层的岩相特征及腹足类化石生存时代，阿达滩盆地的下第三纪应属古近纪渐新世的干柴沟组下部，据该套地层的存在及不整合覆盖于其上的早更新世七个泉组分析，推断阿达滩盆地在渐新世末存在一次较强规模的隆起。     

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...