摘要
对我国已报道的113属349种泥盆纪海相双壳类的地史和地理分布进行总结,讨论这一时期双壳类动物群的组成和主要特征,提出我国泥盆纪双壳类组合序列,并深入讨论了我国早、中泥盆世双壳类生物地理分区及各区双壳类动物群的特征;划分出我国早、中泥盆世的4个海相双壳类群落,其中3个为浅海、近滨至陆棚双壳类群落,另一个为较深水浮游相双壳类群落.此外,还对双壳类的生活习性进行了简要讨论.
Devonian bivalves are well-developed, highly diversified, and widely distributed both in platform and basinal depositional environments in China. This paper gives a brief description of the Chinese Devonian faunas, Devonian bivalve assemblages, with a discussion on bivalve biogeograptiy, Devonian marine bivalve communities and life-habits of various species in China. ABUNDANCE, DISTRIBUTION AND DIVERSITY OF DEVONIAN BIVALVES OF CHINA Over the last decade, a great deal of information about Devonian bivalves has been gathered throughout China. Up to now, marine bivalves have been found from 122 localities including 349 species placed in 113 genera and 39 families (Fig. 1). Geographically, Devonian bivalve faunas are present in most depositional regions of China, such as Guangxi, Hunan, East Yunnan and the Longmenshan district of northern Sichuan, where Devonian bivalves are most aboundant and best known. In addition, fairly diverse faunas have been reported from the Junggar area of Xinjiang, Heilongjiang and Inner Mongolia in West and Northeast China. Stratigraphically, in China the Lower and Middle Devonian strata contain well-developed bivalve faunas which were flourishing during late Early Emsian and Givetian times; however, they became sharply declined during the Late Devonian (Fig. 2). Altogether six subclasses of Bivalvia (Newell, 1969) are represented in the Devonian of China. Among them, Palaeotaxodonta account for 15.9% of the genera (including 3 genera of Antactinodion tidae, which are uncertain in classification position); Praecaldioida 5.4%; Pteriomorphia 38% (Pterineidae 11.5%, Ambonychiidae 8.9%); Palaeoheterodonta 17.7%; Heterodonta 8.8%; and Anomalodesmata 14.2%. These faunas are characterized by: (a) well-developed and highly diversified bivalves, with Pterineidae and Ambonychiidae as the especially flourishing taxa; (b) times of high endemism, with the number of endemic genera sharply decreasing in Emsian-Frasian (from 13, 7, 4, to 1 only), but a cosmopolitan fauna came into existence in the Upper
出处
《古生物学报》
CAS
CSCD
北大核心
1992年第6期734-755,共22页
Acta Palaeontologica Sinica
关键词
泥盆纪
双壳类
古生物地理学
Devonian, bivalve, palaeogeography, China
