Post-Cambrian trilobite diversity and evolutionary faunas

被引:96
作者
Adrain, JM
Fortey, RA
Westrop, SR
机构
[1] Nat Hist Museum, Dept Palaeontol, London SW7 5BD, England
[2] Univ Oklahoma, Sch Geol & Geophys, Norman, OK 73019 USA
[3] Univ Oklahoma, Oklahoma Museum Nat Hist, Norman, OK 73019 USA
关键词
D O I
10.1126/science.280.5371.1922
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A cluster analysis of the stratigraphic distribution of all Ordovician trilobite families, based on a comprehensive taxonomic database, identified two major faunas with disjunct temporal diversity trends. The Ibex Fauna behaved as a cohort, declining through the Ordovician and disappearing at the end-Ordovician mass extinction. In contrast, the Whiterock Fauna radiated rapidly during the Middle Ordovician and gave rise to all post-Ordovician trilobite diversity. Its pattern of diversification matches that of the Paleozoic Evolutionary Fauna; hence, trilobites were active participants in the great Ordovician radiations. Extinction patterns at the end of the Ordovician are related to clade size: Surviving trilobite families show higher genus diversity than extinguished families.
引用
收藏
页码:1922 / 1925
页数:4
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