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Grypania spiralis
Grypania spiralis fossil
Scientific classification
Kingdom: Protista
Genus: Grypania
Species: G. spiralis
Binomial name
Grypania spiralis
Walter, Oehler & Oehler, 1976[1]

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 2,100 million years ago[2], and the youngest extended into the Mesoproterozoic Era. Grypania reproduced asexually.


  1. ^ Walter, M. R., Oehler, J. H. & Oehler, D. Z. 1976. Megascopic algae 1,300 million years old from the Belt supergroup, Montana: A reinterpretation of Walcott's Helminthoidichnites. Journal of Paleontology, 50(5): 872-881.
  2. ^ 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. (Abstract)

See also


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