Corumbella
| Corumbella | ||||||||||||
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Reconstruction of Corumbrella werneri |
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| Temporal occurrence | ||||||||||||
| Upper Neoproterozoic | ||||||||||||
| approx. 600 million years | ||||||||||||
| Locations | ||||||||||||
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Corumba, Brazil |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Corumbella | ||||||||||||
| Hahn , Hahn , Leonardos , Pflug & Walde , 1982 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Corumbella werneri | ||||||||||||
| G. Hahn, R. Hahn, Leonardos, Pflug & Walde, 1982 | ||||||||||||
The Corumbella is a fossil in a somewhat uncertain position that was discovered in 1980 by the geologist Detlef Walde from the University of Brasília . The site was a limestone quarry near the southern Brazilian city of Corumbá on the edge of the Pantanal in the Brazilian-Bolivian border area.
features
These are narrow, curled tubes that widen from the apex to an approximately square cross-section with rounded corners (tetraradial symmetry). The tubes were up to 80 mm long and measured at the upper end up to 25 mm, at the lower end about 2 mm in diameter. The tubes sat on an organic substrate and multiplied by budding. Corumbella is interpreted as a colonial cnidarians and as a sessile predator.
Systematic position
According to Babcock et al. (2003) shows the morphology of the tubes and the shape of the colony close relationships with the Scyphozoa, especially with the recent genus Stephanoscyphus . The first descriptors established a new family Corumbellidae, a new order Corumbellida and a new subclass Corumbellata for the species. Babcock et al. but reject subclass and order as too uncertain.
Age
Corumbella werneri has so far only been described from the Corumba locality in Brazil . The location is in the lithostratigraphic Tamengo formation of the Corumba group. The age of the place of discovery could not yet be determined exactly. The find is definitely from the Upper Neoproterozoic. The age of the Corumba group was estimated to be 600 million years. The Tamengo formation lies in the higher part of the Corumba group. Similar finds were made in 1993 in the Gaojiashan region in eastern China. Their age is estimated to be 550 million years.
meaning
Babcock et al. (2003) mention a previously undescribed species of Corumbella from the Wood Canyon Formation of the Nopah Range, Nye County, Nevada, which was described by James Hagadorn and Ben Wagoner. The authors take this as an indication that the Amazon craton and Laurentia were probably geographically close to each other at the time.
Individual evidence
- ↑ Current Research No. 5 with picture ( Memento from August 26, 2007 in the Internet Archive )
literature
- Loren E. Babcock, Anne M. Grunow, Georg Robert Sadowski and Stephen A. Leslie: Corumbella, an Ediacaran-grade organism from the Late Neoproterozoic of Brazil. Palaeogeography, Palaeoclimatology, Palaeoecology, 220: 7-18, Amsterdam 2005 ISSN
- James W. Hagadorn and Ben M. Wagoner: Ediacaran fossils from the southwestern Great Basin, United States. Journal of Paleontology, 74: 349-359, 2000.
Web links
- Corumella in parTU (PDF; 1.8 MB)