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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ftconicet:oai:ri.conicet.gov.ar:11336/198832 2023-10-09T21:47:15+02:00 The coracoids in functional and morphological studies of penguins (Aves, Spheniscidae) of the Eocene of Antarctica Acosta Hospitaleche, Carolina Ileana Alicia Di Carlo, Ulises application/pdf http://hdl.handle.net/11336/198832 eng eng Università degli Studi di Milano info:eu-repo/semantics/altIdentifier/url/https://riviste.unimi.it/index.php/RIPS/article/view/5938 info:eu-repo/semantics/altIdentifier/doi/10.13130/2039-4942/5938 http://hdl.handle.net/11336/198832 Acosta Hospitaleche, Carolina Ileana Alicia; Di Carlo, Ulises; The coracoids in functional and morphological studies of penguins (Aves, Spheniscidae) of the Eocene of Antarctica; Università degli Studi di Milano; Rivista Italiana di Paleontologia e Stratigrafia; 116; 1; 3-2010; 23-34 0035-6883 2039-4942 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-sa/2.5/ar/ Eocene Antarctica Fossil penguin Functional morphology Diving mechanic https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.13130/2039-4942/5938 2023-09-24T18:22:34Z 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. Fil: Acosta Hospitaleche, Carolina Ileana Alicia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina Fil: Di Carlo, Ulises. Instituto Superior del Profesorado Juan Nepomuceno Terrero.; Argentina Article in Journal/Newspaper Antarc* Antarctica Seymour Island CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) Alicia ENVELOPE(-63.483,-63.483,-64.833,-64.833) Acosta ENVELOPE(-62.050,-62.050,-64.700,-64.700) Ulises ENVELOPE(-61.483,-61.483,-64.400,-64.400) |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Eocene Antarctica Fossil penguin Functional morphology Diving mechanic https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Eocene Antarctica Fossil penguin Functional morphology Diving mechanic https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Acosta Hospitaleche, Carolina Ileana Alicia Di Carlo, Ulises The coracoids in functional and morphological studies of penguins (Aves, Spheniscidae) of the Eocene of Antarctica |
topic_facet |
Eocene Antarctica Fossil penguin Functional morphology Diving mechanic https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
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. Fil: Acosta Hospitaleche, Carolina Ileana Alicia. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina Fil: Di Carlo, Ulises. Instituto Superior del Profesorado Juan Nepomuceno Terrero.; Argentina |
format |
Article in Journal/Newspaper |
author |
Acosta Hospitaleche, Carolina Ileana Alicia Di Carlo, Ulises |
author_facet |
Acosta Hospitaleche, Carolina Ileana Alicia Di Carlo, Ulises |
author_sort |
Acosta Hospitaleche, Carolina Ileana Alicia |
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 |
Università degli Studi di Milano |
url |
http://hdl.handle.net/11336/198832 |
long_lat |
ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-63.483,-63.483,-64.833,-64.833) ENVELOPE(-62.050,-62.050,-64.700,-64.700) ENVELOPE(-61.483,-61.483,-64.400,-64.400) |
geographic |
Argentina Seymour Seymour Island Alicia Acosta Ulises |
geographic_facet |
Argentina Seymour Seymour Island Alicia Acosta Ulises |
genre |
Antarc* Antarctica Seymour Island |
genre_facet |
Antarc* Antarctica Seymour Island |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://riviste.unimi.it/index.php/RIPS/article/view/5938 info:eu-repo/semantics/altIdentifier/doi/10.13130/2039-4942/5938 http://hdl.handle.net/11336/198832 Acosta Hospitaleche, Carolina Ileana Alicia; Di Carlo, Ulises; The coracoids in functional and morphological studies of penguins (Aves, Spheniscidae) of the Eocene of Antarctica; Università degli Studi di Milano; Rivista Italiana di Paleontologia e Stratigrafia; 116; 1; 3-2010; 23-34 0035-6883 2039-4942 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-sa/2.5/ar/ |
op_doi |
https://doi.org/10.13130/2039-4942/5938 |
_version_ |
1779310213688459264 |