The Cambrian evolutionary stages of agnostids

被引：0

作者：

Naimark, EB ^{[1
]}

Markov, AV ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Paleontol, Moscow V71, Russia

来源：

PALEONTOLOGICHESKII ZHURNAL | 2001年 / 06期

关键词：

D O I：

暂无

中图分类号：

Q91 [古生物学];

学科分类号：

0709 ; 070903 ;

摘要：

The duration of the existence and geographic ranges of agnostid genera with different morphological characters are analyzed. Genera with no transglabellar furrows and/or transaxial furrows and/or smoothed axial glabellar furrow tend to have smaller geographic and stratigraphic ranges, whereas genera with two transaxial furrows on the cephalon and pygidium and/or long axis are characterized by increased ranges. The Cambrian evolution of agnostids comprises two stages differing in rates of origination and extinction, mean duration, and dominant morphology of the genera. Phases of growth, acme, and decline are distinguished within each stage.

引用

页码：50 / 60

页数：11

共 50 条

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