浙江和江西二叠/三叠系界线以下的软骨鱼类微体化石——华南二叠/三叠系界线上下鱼类序列研究之五

记述了浙江长兴县煤山剖面、江西修水县四都乡东岭剖面和信丰县铁石口镇铁石口剖面二叠/三叠系界线以下的软骨鱼类10个类别的微体化石,包含5科6属5种,其中有3新属5新种,它们是:刘氏煤山鲨(Meishanselache liuigen.et sp.nov.)、王氏长兴鲨(Changxingsela-che wangigen.et sp.nov.)、东岭中华尖齿鲨(Sinacrodus donglingensis gen.et sp.nov.)、修水滑齿鲨(Lissodus xiushuiensis sp.nov.)和江西多尖齿鲨(Polyacrodus jiangxiensis sp.nov.)。浙、赣两省的这批软骨鱼类微体化石显示两个特点:组成以弓鲛超科化石为主;发现于特提斯区三叠纪的鲨类与发现于中国南方晚二叠世的鲨类具有密切的亲缘关系。这是包含全球二叠/三叠系界线层型剖面和点位(GSSP)在内的全球二叠/三叠系界线以下软骨鱼类微体化石序列的首次报道。软骨鱼类是我国鱼类化石研究中最为薄弱的一个环节,本文化石的记述大大地填补了这个薄弱环节。

CHONDRICHTHYAN MICROREMAINS UNDER PERMIAN-TRIASSIC BOUNDARY BOTH IN ZHEJIANG AND JIANGXI PROVINCES, CHINA - FIFTH REPORT ON THE FISH SEQUENCE STUDY NEAR THE PERMIAN-TRIASSIC BOUNDARY IN SOUTH CHINA

The Permian-Triassic boundary strata are stable throughout the whole Yangtze Platform, especially, the GSSP of Permian-Triassic boundary defined at the Meishan section D, Changxing County of Zhejiang Province, China.But none of fish microfossils in the Permian-Triassic boundary beds in South China were formally described before.This is the first report on fish microfossils in the GSSP of P/T boundary in the world.The chondrichthyan microfossils dealt with in this paper were collected from the Permian-Triassic boundary beds in Meishan section of Changxing County, Zhejiang Province, Dongling section of Xiushui County and Tieshikou section of Xinfeng County, Jiangxi Province, South China.The chondrichthyan remains include Elasmobranchii order and family incertae sedis: Meishanselache liui gen.et sp.nov., Chang-xingselache wangi gen.et sp.nov., Ctenacanthidae gen.et sp.indet.; Hybodontoidea: Hybo-dontoid scale type-1, Hybodontidae gen.et sp.indet.; Acrodontidae: Sinacrodus donglingensis gen.et sp.nov.; Polyacrodontidae: Lissodus xiushuiensis sp.nov., Polyacrodus jiangxiensis sp.nov.; and Neoselachian tooth type-1, Neoselachian scale type-1.The material described herein is housed in the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP), Chinese Academy of Sciences.