广西东部早泥盆世晚期盔甲鱼类一新属  

trunk--Shield and vental Plates of trunk--Shield with pectoral fin), x 2 A NEW GENUS OF GALEASPIDA FROM THE LATE EARLY DEVOMAN OF EASTERN GUANGXI, SOUTH CHINA

作　　者：王士涛[1] 王俊卿[2] 王念忠[2] 张振贤 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国科学院古脊椎动物与古人类研究所,北京100044 [3]广西地矿局地质研究所,南宁530023

出　　处：《古脊椎动物学报》2001年第3期157-167,T001,T002,共13页Vertebrata Palasiatica

基　　金：国家自然科学基金项目(编号:48970081;49572081)资助。

摘　　要：描述了产自广西东部平乐下泥盆统贺县组的一脊椎动物群中的无颌类化石，建立了盔 甲鱼类的一新属、新种──平乐圆盘鱼（Ｄｉｓｃａｓｐｉｓ ｐｉｎｇｌｅｎｓｉｓ ｇｅｔ． ｅｔ ｓｐ． ｎｏｖ．）。圆盘鱼鳃囊 数目多达３２对。同层产出的尚有保存较完好的胴甲鱼目中华鱼科化石。该动物群的发现为 华南区早泥盆世晚期脊椎动物群的演化及其生物地层的对比提供了重要依据。The late Early Devonian vehebrate fossils including antiarehs and POlyb^hiaspids were collected from YUantou Valley, jingle County of Eastern Guangxi. The anhareh fOSsils were named Dayaoshania youngi by Wang Shitao in fotohie et al. (1992), and refermd tO the Sinolepidae. Dayaoshania has no median vental plate, similar tO Dujingolepis. Afchonolepis and Anolepis of SOuth China and Grenfellaspis of AuStlulia. In this Paper the polybaxhiaspid fossils are described, and the Discaspis pinglensiS- Dayaoshania youngi Paleoconuntalty is termed, represenhng the late Early Devonian PaleocOInmndty in the He-clan Formation of Guangxi (unnamed PaleoconUnwhty in Wang, 1991). Class Galeaspida SUbclass POlybranchiaspida Order DUyunolepidida Pan & Wang, 1978 FamnY DUyunolepidae Pan & wang, 1978 Genus ffecaspis gee. nov. diagnosis Chphalic shield covered by cycloid calapase with a round rostlal margin and without POsterior process; POsterior comers leaf--Shaped; nasO--hypophysial fenesthe slightly longitudinal round or cycloid; OrbitS round and ndddie size; hearty--tWopairs of branchial chambers and wide posterior cephalic region ladder shaped; Padem of sensory lines in the dorsal shield with tWo Phallel main lateral canals, one mediO--transversal co^sure and five latero--~versal canajs with the bifUI'Cated ends;a pair of curved sensory canajs siftting in the main lateral canals POstendarendly. Remarks TIs new form is similar in general shape tO polybaxhiaspidi Polybranchiaspis, DongfangaSPI's and Dnyunolepis, particularly similar tO Dongfangaspis in the sensory lines and developed pectolal corners. It is different from POlybranchiaspis and DongfangaspiS from YUnnan in itS hearty--tWo branchial chambers. Discaspl's differs from Duyunolepis in the number of b^hial chaxnbers, the curved sensory canals and the absence of the POsterior Process. Thaotongaspis janvieri (Wang and Zhu, 1994), tefened tO Polybranchiaspiformes and Zhaotongaspidae, heart thirty--five pairs of branchial chambers like the new genus, but differs in itS lateral

关 键 词：广西 早泥盆世 脊椎动物 无颌类盔甲鱼类化石 

分 类 号：Q915.861[天文地球—古生物学与地层学]