中生代海相双壳类(软体动物)的漂浮与假漂浮  

PLANKTON AND PSEUDOPLANKTON OF THE MARINE MESOZOIC BIVALVES

作　　者：沙金庚[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2003年第3期408-416,共9页Acta Palaeontologica Sinica

基　　金：国家自然科学基金 (No .40 0 72 0 0 4);中国科学院知识创新工程项目(KZCX2 114 )资助课题

摘　　要：中生代很多海相足丝固着和粘结固着的表栖双壳类有着广泛的、甚至全球的地理分布 ,有些种能够穿越赤道 ,跨越特提斯海 ,进行南、北高纬度生物群的交流 ,有些种能够由东向西横渡浩瀚的古太平洋进行扩散 ,因为这些双壳类幼虫期的浮游异养型幼虫能营漂浮生活 。In the Mesozoic, numerous epi byssate and cemented marine bivalves were distributed in the following three patterns. 1) Global distribution: Many bivalves, such as Halobia including the Late Triassic Carnian Norian Halobia austriaca Mojsiscovics, Early Jurassic Hettangian Early Cretaceous Valanginian Camptonectes (Camptonectes) auritus (von Schlotheim) and Early Jurassic Hettangian Late Jurassic Tithonian (=Volgian) Chlamys (Chlamys) tetoria (von Schlotheim), almost occupied almost all of the world. 2) Antitropical distribution: Lots of bivalves, e.g. Late Jurassic Oxfordian Praebuchia kirghisensis (Sokolow), Early Kimmeridgian Buchia concentrica (J. de C. Sowerby), Late Kimmeridgian Middle Volgian Buchia mosquensis (von Buch), Kimmeridgian Tithonian Buchia spitiensis (Holdhaus) (= Buchia subspitiensis Krumbeck) and Buchia blanfordiana (Stoliczka); Early Cretaceous latest Middle Barremian Middle Albian Aucellina caucasica (von Buch) and Aucellina aptiensis (d'Orbigny) and Albian Aucellina gryphaeoides (J. de C. Sowerby) (= Aucellina coquandiana d'Orbigny) had a bipolar distribution. 3) Pan tropical distribution: A number of bivalves including Jurassic ostreids such as Actinostreon gregareum (J. Sowerby), Liostrea birmanica Reed, Gryphaea (Bilobissa) bilobata J. de C. Sowerby, Nanogyra nana (J. Sowerby) and Eligmus rollandi Douville were only limited between palaeo latitudes 60°north and south. All these bivalves have large planktotrophic larval shells, and byssal notches or attachment areas. These features have demonstrated that the bivalves underwent a plankton life during their larval stage, and they attached to the movable objects including driftwoods, cephalopods, ecnoids and the others to disperse with oceanic currents in the post larval stage. Through the plankton and pseudoplankton, along the oceanic currents, continental margins, island chains, and even the getways of deep sea, the real cosmopolitans could colonize

关 键 词：中生代 双壳类 软体动物 漂浮 假漂浮 

分 类 号：Q915.817[天文地球—古生物学与地层学]