Mesoproterozoic Archaeoellipsoides: Akinetes of heterocystous cyanobacteria

被引：93

作者：

Golubic, S

Sergeev, VN

Knoll, AH

机构：

[1] RUSSIAN ACAD SCI,INST GEOL,MOSCOW 109017,RUSSIA

[2] HARVARD UNIV,BOT MUSEUM,CAMBRIDGE,MA 02138

来源：

LETHAIA | 1995年 / 28卷 / 04期

关键词：

akinetes; atmosphere oxygen; cyanobacteria; heterocyst; microbial fossils; nitrogen fixation; peritidal; Proterozoic;

D O I：

10.1111/j.1502-3931.1995.tb01817.x

中图分类号：

Q91 [古生物学];

学科分类号：

0709 ; 070903 ;

摘要：

The genus Archaeoellipsoides Horodyski & Donaldson comprises large (up to 135 mu m long) ellipsoidal and rod-shaped microfossils commonly found in silicified peritidal carbonates of Mesoproterozoic age. Based on morphometric an akinetes of modem bloom-forming Anabaena species, Archaeoellipsoides is interpreted as the fossilized remains of akinetes produced by planktic heterocystous cyanobacteria. These fossils set a minimum date for the evolution of derived cyanobacteria capable of marked cell differentiation, and they corroborate geochemical evidence indicating that atmospheric oxygen levels were well above 1% of present day levels 1,500 million years ago.

引用

页码：285 / 298

页数：14

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