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Temporal range: PaleoproterozoicMesoproterozoic
Grypania spiralis.JPG
Grypania spiralis fossil
Scientific classification e
Domain: Eukaryota
Genus: Grypania
Walter, Oehler & Oehler, 1976[1]
Type species
Grypania spiralis
Walter, Oehler & Oehler, 1976

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[citation needed] to have been a eukaryotic alga. The oldest probable Grypania fossils date to about 2.1 billion years ago,[2] and the youngest extended into the Mesoproterozoic era. Grypania reproduced asexually[citation needed].


  1. ^ M. R. Walter, John H. Oehler & Dorothy Z. Oehler (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. JSTOR 1303584. 
  2. ^ T. M. Han & B. Runnegar (1992). "Megascopic eukaryotic algae from the 2.1-billion-year-old negaunee iron-formation, Michigan". Science. 257 (5067): 232–235. Bibcode:1992Sci...257..232H. doi:10.1126/science.1631544. PMID 1631544. 

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