Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups

doi:10.1016/j.geobios.2008.09.006

	Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups
	Kroeger, Bjoern 1,2; Zhang, Yunbai (张允白)3 ; Isakar, Mare 4
	2009-05-01
发表期刊	GEOBIOS
ISSN	0016-6995
卷号	42 期号:3 页码:273-292
摘要	Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle Ordovician) from Oland Island, Sweden and North Estonia are described for the first time. We demonstrate that a high generic and specific diversity of Oncocerida was already established in the earliest Darriwilian. The new oncocerid species Neumatoceras borense nov. sp., N. breviborense nov. sp., Paramiamoceras breviventrum nov. sp., Richardsonoceras gastroscopium nov. sp., R. gerhardi nov. sp., R. goldinanni nov. sp., R. haelluddenense nov. sp., Richardsonoceroides kingi nov. sp., R. oelandense nov. sp., and R. rhytium nov. sp. are erected; Richardsonoceroides schiefferdeckeri (Dewitz) is revised. The new graciloceratid Kundoceras evansi nov. gen., nov. sp. is erected. A review of records of early oncocerids from China shows that Richardsonoceras Foerste is probably the most primitive oncocerid and supports the hypothesis that oncocerids evolved in the early Floian or latest Tremadocian from a Bassleroceras Ulrich and Foerste-like ancestor. The new discosorid genus Paldoceras nov. gen. and species Paldoceras paldiskense nov. sp. and P. neptunsakerense nov. sp. are erected. These discosorids record the morphological link between the late Darriwilian Ruedemannoceras Flower and the early Floian Apocrinoceras Teichert and Glenister, which is considered to be the earliest discosorid. (C) 2009 Elsevier Masson SAS. All rights reserved.
关键词	Darriwilian Oncocerida Discosorida Baltoscandia
DOI	10.1016/j.geobios.2008.09.006
语种	英语
关键词[WOS]	Nautiloids ; Sweden
资助项目	Estonian Science Foundation[3189] ; Estonian Science Foundation[6623]
WOS研究方向	Paleontology
WOS类目	Paleontology
WOS记录号	WOS:000267274200003
项目资助者	Estonian Science Foundation
出版者	ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/224
专题	中国科学院南京地质古生物研究所其他
通讯作者	Kroeger, Bjoern
作者单位	1.Univ Lille 1, Lab Paleontol & Paleogeog Paleozo LP3, F-59655 Villeneuve Dascq, France 2.Humboldt Univ, Museum Naturkune, D-10115 Berlin, Germany 3.Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 4.Univ Tartu, Geoloogiamuuseum, EE-51014 Tartu, Estonia
推荐引用方式 GB/T 7714	Kroeger, Bjoern,Zhang, Yunbai ,Isakar, Mare. Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups[J]. GEOBIOS,2009,42(3):273-292.
APA	Kroeger, Bjoern,Zhang, Yunbai ,&Isakar, Mare.(2009).Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups.GEOBIOS,42(3),273-292.
MLA	Kroeger, Bjoern,et al."Discosorids and Oncocerids (Cephalopoda) of the Middle Ordovician Kunda and Aseri Regional Stages of Baltoscandia and the early evolution of these groups".GEOBIOS 42.3(2009):273-292.