KMS Nanjing Institute of Geology and Palaeonotology,CAS
The Late Ordovician and Early Silurian pentameride brachiopod Holorhynchus Kiaer, 1902 from North China | |
Rong, JY (戎嘉余); Zhan, RB (詹仁斌); Jin, JS | |
2004-03-01 | |
发表期刊 | JOURNAL OF PALEONTOLOGY |
ISSN | 0022-3360 |
卷号 | 78期号:2页码:287-299 |
摘要 | Holorhynchus giganteus Kiaer, 1902, a common Late Ordovician (mid-Ashgill) pentameride brachiopod in the Baltic region, Kazakhstan, and southern Tien Shan, is documented for the first time from the Badanjilin Formation (mid-Ashgill) of western Inner Mongolia (Alxa block), North China. Serial sections of the Chinese material confirm the presence of a vestigial ventral median septum in the early growth stage of H. giganteus, but the septum becomes embedded in the secondary shell thickening at the adult growth stage. A survey of the type material from Norway and additional material from other regions indicates that the incipient ventral median septum is a much more commonly developed structure than was previously believed. The presence of a well-developed pseudodeltidium in the Tien Shan material of H. giganteus and the absence of such a structure in conspecific material from many other regions require a systematic revision of the generic group. Holorhynchus has rodlike crura (=brachial processes) that do not form flanges at their junctions with the inner hinge plates (=outer plates crural plates) and outer hinge plates (inner plates). This, together with the development of a crude spondylial comb structure, points to its affinity to the Virgianidae rather than to the Stricklandiidae. Holorhynchus can be regarded as a Lazarus taxon because of its absence during the crisis (Hirnantian) and survival (early-middle Rhuddanian) intervals associated with the Late Ordovician mass extinction and its reappearance in Kazakhstan and North China during the Early Silurian (late Rhuddanian-early Aeronian), The mid-Ashgill Holorhynchus fauna, typified by a number of large-shelled pentamerides, was common in the Baltic region, the Urals, Kazakhstan, Tien Shan, AIxa, Qaidam, Kolyma, and east-central Alaska, but largely absent from Laurentia and Siberia (except for Taimyr) in the ancient tropical-subtropical regions. This paleobiogeographic pattern agrees with the general pattern of the Late Ordovician brachiopod provincialism. |
语种 | 英语 |
关键词[WOS] | Island ; Extinction ; Family ; Faunas |
WOS研究方向 | Paleontology |
WOS类目 | Paleontology |
WOS记录号 | WOS:000188661400004 |
出版者 | PALEONTOLOGICAL SOC INC |
文献类型 | 期刊论文 |
条目标识符 | http://ir.nigpas.ac.cn/handle/332004/1080 |
专题 | 中国科学院南京地质古生物研究所 其他 |
通讯作者 | Rong, JY (戎嘉余) |
作者单位 | 1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 2.Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada |
推荐引用方式 GB/T 7714 | Rong, JY ,Zhan, RB ,Jin, JS. The Late Ordovician and Early Silurian pentameride brachiopod Holorhynchus Kiaer, 1902 from North China[J]. JOURNAL OF PALEONTOLOGY,2004,78(2):287-299. |
APA | Rong, JY ,Zhan, RB ,&Jin, JS.(2004).The Late Ordovician and Early Silurian pentameride brachiopod Holorhynchus Kiaer, 1902 from North China.JOURNAL OF PALEONTOLOGY,78(2),287-299. |
MLA | Rong, JY ,et al."The Late Ordovician and Early Silurian pentameride brachiopod Holorhynchus Kiaer, 1902 from North China".JOURNAL OF PALEONTOLOGY 78.2(2004):287-299. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论