Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica
The Antarctic pelagornithid record is restricted to few isolated remains from the Eocene of Seymour Island in the Antarctic Peninsula. Here we report the oldest Antarctic pseudo-toothed bird. It is represented by an incomplete humerus lacking its proximal end, which comes from the lower Eocene level...
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ftbioone:10.1017/jpa.2015.48 2024-06-02T07:58:03+00:00 Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero world 2015-09-01 text/HTML https://doi.org/10.1017/jpa.2015.48 en eng The Paleontological Society doi:10.1017/jpa.2015.48 All rights reserved. https://doi.org/10.1017/jpa.2015.48 Text 2015 ftbioone https://doi.org/10.1017/jpa.2015.48 2024-05-07T00:47:45Z The Antarctic pelagornithid record is restricted to few isolated remains from the Eocene of Seymour Island in the Antarctic Peninsula. Here we report the oldest Antarctic pseudo-toothed bird. It is represented by an incomplete humerus lacking its proximal end, which comes from the lower Eocene levels of the La Meseta Formation (Seymour Island). This new specimen facilitates a review of all known pelagornithids from this continent. Antarctic pelagornithids were classified into two morphotypes that exhibit a mix of putative plesiomorphic and derived characters. Considering the worldwide pelagornithid record and according to estimated wingspans, four approximate size-types were identified. The oldest Antarctic specimens (two fragmentary humeri, middle Ypresian) were assigned to morphotype 1 and correspond to the large size-type. The younger materials (Bartonian/?Priabonian) here assigned to morphotype 2 (some cranial remains, fragmentary tarsometatarsus and humerus) correspond to the giant size-type and represent one of the largest known pseudo-toothed birds. Even though species level phylogenetic affinities of Pelagornithidae remain poorly resolved, three key evolutionary events can be recognized: (1) the disappearance of Dasornis in the Early Eocene and the appearance of more advanced forms with a trend to the specialization of large soaring capacity, (2) the origin of Pelagornis sensu lato species in the early Oligocene, and (3) the appearance and dominance of a highly specialized terminal group at Mio/Pliocene time span. Text Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island BioOne Online Journals Antarctic Antarctic Peninsula Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) The Antarctic Journal of Paleontology 89 5 870 881 |
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BioOne Online Journals |
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ftbioone |
language |
English |
description |
The Antarctic pelagornithid record is restricted to few isolated remains from the Eocene of Seymour Island in the Antarctic Peninsula. Here we report the oldest Antarctic pseudo-toothed bird. It is represented by an incomplete humerus lacking its proximal end, which comes from the lower Eocene levels of the La Meseta Formation (Seymour Island). This new specimen facilitates a review of all known pelagornithids from this continent. Antarctic pelagornithids were classified into two morphotypes that exhibit a mix of putative plesiomorphic and derived characters. Considering the worldwide pelagornithid record and according to estimated wingspans, four approximate size-types were identified. The oldest Antarctic specimens (two fragmentary humeri, middle Ypresian) were assigned to morphotype 1 and correspond to the large size-type. The younger materials (Bartonian/?Priabonian) here assigned to morphotype 2 (some cranial remains, fragmentary tarsometatarsus and humerus) correspond to the giant size-type and represent one of the largest known pseudo-toothed birds. Even though species level phylogenetic affinities of Pelagornithidae remain poorly resolved, three key evolutionary events can be recognized: (1) the disappearance of Dasornis in the Early Eocene and the appearance of more advanced forms with a trend to the specialization of large soaring capacity, (2) the origin of Pelagornis sensu lato species in the early Oligocene, and (3) the appearance and dominance of a highly specialized terminal group at Mio/Pliocene time span. |
author2 |
Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero |
format |
Text |
author |
Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero |
spellingShingle |
Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
author_facet |
Marcos Cenizo Carolina Acosta Hospitaleche Marcelo Reguero |
author_sort |
Marcos Cenizo |
title |
Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
title_short |
Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
title_full |
Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
title_fullStr |
Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
title_full_unstemmed |
Diversity of pseudo-toothed birds (Pelagornithidae) from the Eocene of Antarctica |
title_sort |
diversity of pseudo-toothed birds (pelagornithidae) from the eocene of antarctica |
publisher |
The Paleontological Society |
publishDate |
2015 |
url |
https://doi.org/10.1017/jpa.2015.48 |
op_coverage |
world |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula Seymour Seymour Island The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Seymour Seymour Island The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Seymour Island |
op_source |
https://doi.org/10.1017/jpa.2015.48 |
op_relation |
doi:10.1017/jpa.2015.48 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1017/jpa.2015.48 |
container_title |
Journal of Paleontology |
container_volume |
89 |
container_issue |
5 |
container_start_page |
870 |
op_container_end_page |
881 |
_version_ |
1800741303667916800 |