The earliest known Stegerhynchus (Rhynchonellida, Brachiopoda) from the Hirnantian strata (uppermost Ordovician) at Borenshult, Ostergotland, Sweden
Rong, Jiayu (戎嘉余)1; Jin, Jisuo2; Zhan, Renbin (詹仁斌)1; Bergstrom, Jan3
2008-03-01
发表期刊GFF
ISSN1103-5897
卷号130页码:21-30
摘要

Stegerhynchus eoborealis sp. nov. from the Dalmanitina Beds (Hirnantian, uppermost Ordovician), Borenshult, Ostergotland, Sweden, is described in this study as the earliest known species of Stegerhynchus, within the family Rhynchotrematidae. This implies that Stegerhynchus originated during the latest Ordovician mass extinction event, and radiated in the Silurian Period to become one of most common rhynchonellide brachiopod genera in shallow tropical seas. In the early evolutionary stage of the genus, Stegerhynchus eoborealis already exhibited a notable reduction in the size of septalium compared to the closely related genus Rhynchotrema. Compared to its Silurian counterparts (e.g. Stegerhynchus borealis and S. peneborealis), Stegerhynchus eoborealis has some variable characters within single populations, particularly in the number of costae in the sulcus and on the fold, implying a morphological plasticity during the early evolutionary stage of the genus. During the Hirnantian mass extinction events, five rhynchonellide families were represented by small taxonomic groups, but only the Rhynchotrematidae and Trigonirhynchiidae diversified into many highly successful clades of rhynchonellides during the Silurian and Devonian. However, the Ancistrorhynchidae, Orthorhynchulidae, and Sphenotretidae largely disappeared by the end of the Ordovician, with a few species (such as Plectothyrella sp.) surviving into the earliest Silurian but shortly becoming extinct.

关键词Rhynchonellida Stegerhynchus Eoborealis Sp Nov. Latest Ordovician Hirnantian Sweden
语种英语
关键词[WOS]Oslo-asker District ; Silurian Boundary ; Latest Ordovician ; Fauna ; Evolution ; Norway
WOS研究方向Geology ; Paleontology
WOS类目Geology ; Paleontology
WOS记录号WOS:000256225300003
出版者TAYLOR & FRANCIS LTD
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/143
专题中国科学院南京地质古生物研究所
其他
通讯作者Rong, Jiayu (戎嘉余)
作者单位1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing, Peoples R China
2.Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada
3.Swedish Museum Nat Hist, Dept Palaeozool, S-10405 Stockholm, Sweden
推荐引用方式
GB/T 7714
Rong, Jiayu ,Jin, Jisuo,Zhan, Renbin ,et al. The earliest known Stegerhynchus (Rhynchonellida, Brachiopoda) from the Hirnantian strata (uppermost Ordovician) at Borenshult, Ostergotland, Sweden[J]. GFF,2008,130:21-30.
APA Rong, Jiayu ,Jin, Jisuo,Zhan, Renbin ,&Bergstrom, Jan.(2008).The earliest known Stegerhynchus (Rhynchonellida, Brachiopoda) from the Hirnantian strata (uppermost Ordovician) at Borenshult, Ostergotland, Sweden.GFF,130,21-30.
MLA Rong, Jiayu ,et al."The earliest known Stegerhynchus (Rhynchonellida, Brachiopoda) from the Hirnantian strata (uppermost Ordovician) at Borenshult, Ostergotland, Sweden".GFF 130(2008):21-30.
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