THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA
The partial articulated skeleton MLP 77-V-10-1 comes from the upper levels of La Meseta Formation (Seymour Island, Antarctica) at the southwestern slope of the plateau. These remains were found in the Submeseta Allomember, within the Anthropornis nordenskjoeldi Biozone, dated at 34.2 Ma using stront...
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ftdoajarticles:oai:doaj.org/article:965f41d7709f43d682ca6ae639afbf80 2023-08-27T04:05:35+02:00 THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA CAROLINA ACOSTA HOSPITALECHE ULISES DI CARLO 2010-03-01T00:00:00Z https://doi.org/10.13130/2039-4942/5938 https://doaj.org/article/965f41d7709f43d682ca6ae639afbf80 EN eng Milano University Press https://riviste.unimi.it/index.php/RIPS/article/view/5938 https://doaj.org/toc/0035-6883 https://doaj.org/toc/2039-4942 0035-6883 2039-4942 doi:10.13130/2039-4942/5938 https://doaj.org/article/965f41d7709f43d682ca6ae639afbf80 Rivista Italiana di Paleontologia e Stratigrafia, Vol 116, Iss 1 (2010) Eocene Antarctica Fossil Penguins Functional morphology Diving mechanics Geology QE1-996.5 Paleontology QE701-760 article 2010 ftdoajarticles https://doi.org/10.13130/2039-4942/5938 2023-08-06T00:46:03Z The partial articulated skeleton MLP 77-V-10-1 comes from the upper levels of La Meseta Formation (Seymour Island, Antarctica) at the southwestern slope of the plateau. These remains were found in the Submeseta Allomember, within the Anthropornis nordenskjoeldi Biozone, dated at 34.2 Ma using strontium isotope ratios from shells. MLP 77-V-10-1 is a giant penguin, probably the largest ever described, whose coracoids are strikingly wide at the distal surface. The present contribution is a study of this new fossil penguin, with particular emphasis on the coracoids. The osteography and associated muscles are described. Functional connotations of coracoid morphology are thoroughly discussed and its implications on the mechanics of diving are explored. We concluded that the coracoid morphology suggests a change in diving strategy from the earliest penguins until the living representatives. In the oldest penguins, the improvement of diving capacity would have been linked to the development of stronger bone and probably muscular structures enabling endurance of greater forces operating in a denser medium. In contrast, the Neogene penguins would have optimized the force action of the flight apparatus by developing more precise movements, adjusting the angle of attack of each of the effective forces. Article in Journal/Newspaper Antarc* Antarctica Seymour Island Directory of Open Access Journals: DOAJ Articles Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Eocene Antarctica Fossil Penguins Functional morphology Diving mechanics Geology QE1-996.5 Paleontology QE701-760 |
spellingShingle |
Eocene Antarctica Fossil Penguins Functional morphology Diving mechanics Geology QE1-996.5 Paleontology QE701-760 CAROLINA ACOSTA HOSPITALECHE ULISES DI CARLO THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
topic_facet |
Eocene Antarctica Fossil Penguins Functional morphology Diving mechanics Geology QE1-996.5 Paleontology QE701-760 |
description |
The partial articulated skeleton MLP 77-V-10-1 comes from the upper levels of La Meseta Formation (Seymour Island, Antarctica) at the southwestern slope of the plateau. These remains were found in the Submeseta Allomember, within the Anthropornis nordenskjoeldi Biozone, dated at 34.2 Ma using strontium isotope ratios from shells. MLP 77-V-10-1 is a giant penguin, probably the largest ever described, whose coracoids are strikingly wide at the distal surface. The present contribution is a study of this new fossil penguin, with particular emphasis on the coracoids. The osteography and associated muscles are described. Functional connotations of coracoid morphology are thoroughly discussed and its implications on the mechanics of diving are explored. We concluded that the coracoid morphology suggests a change in diving strategy from the earliest penguins until the living representatives. In the oldest penguins, the improvement of diving capacity would have been linked to the development of stronger bone and probably muscular structures enabling endurance of greater forces operating in a denser medium. In contrast, the Neogene penguins would have optimized the force action of the flight apparatus by developing more precise movements, adjusting the angle of attack of each of the effective forces. |
format |
Article in Journal/Newspaper |
author |
CAROLINA ACOSTA HOSPITALECHE ULISES DI CARLO |
author_facet |
CAROLINA ACOSTA HOSPITALECHE ULISES DI CARLO |
author_sort |
CAROLINA ACOSTA HOSPITALECHE |
title |
THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
title_short |
THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
title_full |
THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
title_fullStr |
THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
title_full_unstemmed |
THE CORACOIDS IN FUNCTIONAL AND MORPHOLOGICAL STUDIES OF PENGUINS (AVES, SPHENISCIDAE) OF THE EOCENE OF ANTARCTICA |
title_sort |
coracoids in functional and morphological studies of penguins (aves, spheniscidae) of the eocene of antarctica |
publisher |
Milano University Press |
publishDate |
2010 |
url |
https://doi.org/10.13130/2039-4942/5938 https://doaj.org/article/965f41d7709f43d682ca6ae639afbf80 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Seymour Seymour Island |
geographic_facet |
Seymour Seymour Island |
genre |
Antarc* Antarctica Seymour Island |
genre_facet |
Antarc* Antarctica Seymour Island |
op_source |
Rivista Italiana di Paleontologia e Stratigrafia, Vol 116, Iss 1 (2010) |
op_relation |
https://riviste.unimi.it/index.php/RIPS/article/view/5938 https://doaj.org/toc/0035-6883 https://doaj.org/toc/2039-4942 0035-6883 2039-4942 doi:10.13130/2039-4942/5938 https://doaj.org/article/965f41d7709f43d682ca6ae639afbf80 |
op_doi |
https://doi.org/10.13130/2039-4942/5938 |
_version_ |
1775357302401925120 |