ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS
With the rapid evolution of reptilian forms during Triassic and Jurassic times, many reptilo-avian forms may have evolved. Two examples of such evolution have been preserved in the Jurassic sediments of Germany (Archaeopteryx and Archaeornis). An anatomical feature, characteristic of birds, and not...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.618.3965 2023-05-15T13:50:53+02:00 ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS Glenny Fred H Fred H. Glenny The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.618.3965 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.618.3965 Metadata may be used without restrictions as long as the oai identifier remains attached to it. https://kb.osu.edu/dspace/bitstream/handle/1811/4191/V54N05_307.pdf;jsessionid=CD2AC58E0FC9BBFE929C9C2E6541B3AE?sequence=1 text ftciteseerx 2016-01-08T14:51:11Z With the rapid evolution of reptilian forms during Triassic and Jurassic times, many reptilo-avian forms may have evolved. Two examples of such evolution have been preserved in the Jurassic sediments of Germany (Archaeopteryx and Archaeornis). An anatomical feature, characteristic of birds, and not reported for either of these forms, is a well-developed sternum (Wetmore, 1951). Since this is an important avian characteristic, neither of these bird-like animals should be con-sidered to be related directly to the ancestors of modern birds. Therefore, other yet undiscovered forms may be regarded as more properly comprising the Archaeornithes, and these ancestral forms may be found to have lived on the Antarctic continent at a time when that land supported a flourishing tropical vegetation and highly varied vertebrate fauna. To explain the uniform presence of a very well-developed sternum in birds would be difficult if this structure were not already present in some ancestral reptile or amphibo-reptile. While a sternum is found in amphibians, there is Text Antarc* Antarctic Antarctica Unknown Antarctic The Antarctic Wetmore ENVELOPE(-63.583,-63.583,-74.633,-74.633) |
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Unknown |
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ftciteseerx |
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English |
description |
With the rapid evolution of reptilian forms during Triassic and Jurassic times, many reptilo-avian forms may have evolved. Two examples of such evolution have been preserved in the Jurassic sediments of Germany (Archaeopteryx and Archaeornis). An anatomical feature, characteristic of birds, and not reported for either of these forms, is a well-developed sternum (Wetmore, 1951). Since this is an important avian characteristic, neither of these bird-like animals should be con-sidered to be related directly to the ancestors of modern birds. Therefore, other yet undiscovered forms may be regarded as more properly comprising the Archaeornithes, and these ancestral forms may be found to have lived on the Antarctic continent at a time when that land supported a flourishing tropical vegetation and highly varied vertebrate fauna. To explain the uniform presence of a very well-developed sternum in birds would be difficult if this structure were not already present in some ancestral reptile or amphibo-reptile. While a sternum is found in amphibians, there is |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Glenny Fred H Fred H. Glenny |
spellingShingle |
Glenny Fred H Fred H. Glenny ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
author_facet |
Glenny Fred H Fred H. Glenny |
author_sort |
Glenny Fred H |
title |
ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
title_short |
ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
title_full |
ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
title_fullStr |
ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
title_full_unstemmed |
ANTARCTICA AS A CENTER OF ORIGIN OF BIRDS |
title_sort |
antarctica as a center of origin of birds |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.618.3965 |
long_lat |
ENVELOPE(-63.583,-63.583,-74.633,-74.633) |
geographic |
Antarctic The Antarctic Wetmore |
geographic_facet |
Antarctic The Antarctic Wetmore |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
https://kb.osu.edu/dspace/bitstream/handle/1811/4191/V54N05_307.pdf;jsessionid=CD2AC58E0FC9BBFE929C9C2E6541B3AE?sequence=1 |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.618.3965 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766254243687170048 |