Biogeographical relationship of the South America–Antarctic Cenozoic bryozoan biota: The example of austral genus Aspidostoma
Summary Insight into the Cenozoic geologic history of the austral genus Aspidostoma is important for the reconstruction of the biogeographical links between South America and Antarctica. Aspidostoma, is commonly widespread throughout the Tertiary in the triangle of Antarctica-South America-Australia...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.598.6130 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea214.pdf |
| Summary: | Summary Insight into the Cenozoic geologic history of the austral genus Aspidostoma is important for the reconstruction of the biogeographical links between South America and Antarctica. Aspidostoma, is commonly widespread throughout the Tertiary in the triangle of Antarctica-South America-Australia-New Zealand, reaches its maximum diversity in the late early Eocene of the La Meseta Formation on Seymour Island (West Antarctica) and has its earliest fossil record in the lower Danian (Roca Formation) of Patagonia (South America). The recently studied Canu collection provides valuable data on the taxonomy and the closest biogeographical Magellanic-Antarctic connection. As with Aspidostoma, other early Paleocene (Danian) bryozoans from Patagonia, including Micropora, Figularia, Exochella and Celleporaria, are remarkable for the evolutionary importance and the recognition of migration routes during the early Cenozoic. In this context, the origin of the Recent Antarctic and the Magellan bryozoans should be traced back to the early Paleogene and Neogene bryozoans from Patagonia. |
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