中国南沙海区全新世小孔亚目(苔藓虫唇口目)的古生态研究  

PALAEOECOLOGY OF HOLOCENE ASCOPHORA (CHEILOSTOMATA,BRYOZOA) FROM THE NANSHA ISLANDS,CHINA

作　　者：陆麟黄[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：《微体古生物学报》1991年第4期423-432,497-498,共10页Acta Micropalaeontologica Sinica

摘　　要：本文简要叙述南沙海区全新世小孔亚目苔藓虫群体形状和生态环境的关系,对非附着生长的类型进行了初步的分类。Thirty-five bryozoan samples collected from the Nansha Islands during 1984 through1988 yielded a total of 64 species of Ascophora belonging to 29 genera. The samples may begrouped into 4 geographic divisions, namely the northeastern, southeastern, south-centraland southwestern areas, based upon the abundance and composition of taxa and theirecological environment. Area Ⅰ is situated to the south of Liyue Tan (Reed Bank), whereonly a few genera are present and the bryozoans are characterized by branch colonies simi-lar to dendroid corals. Area Ⅱ is near Palawan Trough, water depth about 150m (maxi-mum 200m); five samples from this area yielded 26 Ascophoran species of 13 genera; Fami-ly Conescharellinidae are well developed. Area Ⅲ extends from Zengmu Ansha (ZengmuShoal) to Nankan Ansha (Nankan Shoal) with water depth not exceeding 100m, theascophorans from 20 spots are very abundant and diversified in variety of species (61); onlyOsthemosia is absent here. Area Ⅳ is located on the northeastern slope of Natuna Archi-pelngo with a water depth between 100--145m, 6 samples yielded 41 ascophoran species,but Holoporella and Tubucellaria were not found here. The Holocene Ascophora from the Nansha Islands vary in zoarial shapes and ingrowth methods, including incrusting, plate-like, lamellar, bilamellar, bifoliate,hollow-ramose, ramose, dendroid, cylindrical, mushroom-like, reticulated,mammillae-surfaced-pillar, nodular, conical, discus-like, wheel-shaped, fan-shaped, gin-ger-like, hemispherical and spherical forms; some of these are large and thin and live infixed position, but others are small, free, inlaid, floating, trundling or paved. Three largegroups of zoarial shapes were recognized based upon their ecology. The creeping group occupies about 1 / 4 of total collection and be subdivided into 4kinds; (1) stable forms, they lie steadily on substrata, such as Schizoporella unicornis,Arthropoma cecilli, Dakaria granulosa, Perigastrella sp., Schizomavella lepralioides andParasmittina glomerata; they stably attac

关 键 词：苔藓虫 小孔亚目 全新世 古生态 

分 类 号：Q915.815[天文地球—古生物学与地层学]