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


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Grypania — spiralis Gryp …   Wikipédia en Français

  • Grypania spiralis — ? † Grypania spiralis …   Википедия

  • Grypania spiralis —   Grypania spiralis Fósil de Grypania spi …   Wikipedia Español

  • Unikonta — Für die systematische Einteilung der Lebewesen existieren neben und nacheinander verschiedene Vorschläge. Das hier behandelte Taxon entspricht nicht der gegenwärtig in der deutschsprachigen Wikipedia verwendeten Systematik oder ist veraltet …   Deutsch Wikipedia

  • Proterozoikum — Äonothem/ Äon Ärathem/ Ära System/ Periode ≈ Zeitraum (mya) höher höher höher jünger Prä­kambrium Protero­zoikum …   Deutsch Wikipedia

  • Paleoproterozoico — Saltar a navegación, búsqueda Eón Era M. años Fanerozoico   542,0 ±1,0 Proterozoico Neoproterozoico …   Wikipedia Español

  • Paleoproterozoic — The Paleoproterozoic (pronEng|ˌpeɪlɪoʊˌproʊtərəˈzoʊɪk, also spelled Palaeoproterozoic) is the first of the three sub divisions (eras) of the Proterozoic occurring between Ma|2500 |1600 . This is when the continents first stabilized. This is also… …   Wikipedia

  • Multicellular organism — In this image, a wild type Caenorhabditis elegans is stained to highlight the nuclei of its cells. Multicellular organisms are organisms that consist of more than one cell, in contrast to single celled organisms. Most life that can be seen with… …   Wikipedia

  • Detailed logarithmic timeline — Main article: logarithmic timeline This timeline allows one to see the whole history of the universe, the Earth, and mankind in one table. Each row is defined in years ago, that is, years before the present date, with the earliest times at the… …   Wikipedia

  • Evolutionary history of life — Although evidence of early life is scarce and often difficult to interpret, it appears that life appeared on Earth relatively soon (on the geologic time scale) after the planet had cooled enough for liquid water to be present. The dominant theory …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”