A filamentous cyanobacterium showing structured colonial growth from the Early Devonian Rhynie chert
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- 作者：Michael Krings ; Hans Kerp ; Hagen Hass ; Thomas N. Taylor ; Nora Dotzler
- 关键词：colonial growth ; Croftalania venusta nov. gen. et sp ; cyanobacteria ; filament ; microbial mat ; Rhynie chert ; subsection III (Oscillatoriales)
- 刊名：Review of Palaeobotany and Palynology
- 出版年：2007
- 出版时间：September 2007
- 年：2007
- 卷：146
- 期：1-4
- 页码：265-276
- 全文大小：3014 K
文摘
This paper describes a new aquatic filamentous-colonial fossil cyanobacterium from the Early Devonian Rhynie chert that grows on sediment and submerged plant parts. It is associated with the formation of microbial mats, and occurs in structured colonies, in which the individual filaments are aligned more or less parallel into flat, irregular stands, or united radially into hemispherical aggregates; it may also form elongate, fan-shaped tufts. Individual filaments are ![]()
3 μm in diameter, and consist of uniseriate trichomes composed of barrel-shaped cells enveloped in a thin but distinct sheath. Heterocysts and akinetes have not been observed, which suggests that the cyanobacterium belongs to the cyanobacterial subsection III (Oscillatoriales). This is the first account for sessile, structured colonial growth in cyanobacteria from the Rhynie chert.