Grypania

Grypania

Taxobox | color=khaki
name = "Grypania spiralis"


image_width = 240px
image_caption = "Grypania spiralis" fossil
regnum = Protista
genus = "Grypania"
species = "G. spiralis"
binomial = "Grypania spiralis"
binomial_authority = Walter, Oehler & Oehler, 1976 [Walter, M. R., Oehler, J. H. & Oehler, D. Z. 1976. Megascopic algae 1300 milions year old from the Belt supergroup, Montana: A reinterpretation of Walcott's Helminthoidichnites. "Journal of Paleontology", 50(5): 872-881.]

"Grypania" is an early, tube-shaped fossil from the Proterozoic Eon. The organism could have been a giant bacterium or bacterial colony, but because of its size (over one centimeter) and consistent form, is more likely to have been a eukaryotic alga. The oldest probable "Grypania" fossils date to about 2100 million years ago [Han, T. M. & Runnegar, B. 1992. Megascopic eukaryotic algae from the 2.1-billion-year-old negaunee iron-formation, Michigan. "Science", 257(5067): 232-235. [http://www.sciencemag.org/cgi/content/abstract/257/5067/232 (Abstract)] ] , and the youngest extended into the Mesoproterozoic Era. "Grypania" reproduced asexually.

References

ee also

*Proterozoic

*http://www.peripatus.gen.nz/paleontology/MaiLinEvo.html


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