Biology:Parka decipiens

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Short description: Devonian fossil, possibly of an extinct Charophyte alga

Parka decipiens
Temporal range: Devonian
Charophyta - Parka decipiens.JPG
Parka decipiens from the Devonian of Scotland
Scientific classification edit
Missing taxonomy template (fix): Coleochaetales/?
Genus: Parka
Species:
P. decipiens
Binomial name
Parka decipiens
Fleming (1831)

Parka decipiens is a Devonian fossil believed to be an early land plant, and is the only species described in the genus Parka. It bears at least a passing resemblance to the alga Coleochaete,[1] but the significance of this similarity is yet to be established.[2]

Description

The fossils of Parka decipiens seem small circular, elliptic or irregular patches reaching a diameter of 0.5–7.5 centimetres (0.20–2.95 in), with a reticulate structure showing small coaly discs. These discs contain a mass of what could be spores.[3] Ultrastructural examination of these spores has shown that they lack the y-shaped trilete mark, a Y-like scar, that is characteristic of Silurian and Devonian pteridophytes. [4]

References

  1. Delwiche, C.F.; Graham, L.E.; Thomson, N. (1989), "Lignin-Like Compounds and Sporopollenin Coleochaete, an Algal Model for Land Plant Ancestry", Science 245 (4916): 399–401, doi:10.1126/science.245.4916.399, PMID 17744148, Bibcode1989Sci...245..399D, http://www.sciencemag.org/cgi/content/abstract/245/4916/399 
  2. Kenrick, P.; Crane, P.R. (1997), "The Origin and Early Evolution of Plants on Land", Nature 389 (6646): 33–39, doi:10.1038/37918, Bibcode1997Natur.389...33K 
  3. The enigmatic plant Parka decipiens
  4. Hemsley, A.R. (1989). "The ultrastructure of the spores of the Devonian plant Parka decipiens". Annals of Botany 64 (3): 359–367. doi:10.1093/oxfordjournals.aob.a087852. 

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