A filamentous cyanobacterium showing structured colonial growth from the Early Devonian Rhynie chert

作者：Krings Michael^*; Kerp Hans; Hass Hagen; Taylor Thomas N; Dotzler Nora

来源：Review of Palaeobotany and Palynology, 2007, 146(1-4): 265-276.

DOI：10.1016/j.revpalbo.2007.05.002

• colonial growth
• Croftalania venusta nov gen. et sp
• cyanobacteria
• filament
• microbial mat
• Rhyme chert
• subsection III (Oscillatoriales)

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 fort-nation 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 similar to 3 mu m 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 Rhyme chert.

• 出版日期2007-9