A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru)
Abstract: In the present study, we present a new monachine phocid, Magophoca brevirostris n. gen., n. sp., the fifth monachine described from the Pisco Formation (Peru). Coming from the Cerro la Bruja level at the locality of the same name, Magophoca n. gen. is the geologically oldest known seal fro...
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ftunivantwerpen:c:irua:205997 2024-06-23T07:55:15+00:00 A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) Dewaele, Leonard de Muizon, Christian 2024 https://hdl.handle.net/10067/2059970151162165141 https://repository.uantwerpen.be/docstore/d:irua:23742 eng eng info:eu-repo/semantics/altIdentifier/doi/10.5252/GEODIVERSITAS2024V46A3 info:eu-repo/semantics/altIdentifier/isi/001207998700001 info:eu-repo/semantics/openAccess 1280-9659 Geodiversitas Biology info:eu-repo/semantics/article 2024 ftunivantwerpen https://doi.org/10.5252/GEODIVERSITAS2024V46A3 2024-06-11T14:16:30Z Abstract: In the present study, we present a new monachine phocid, Magophoca brevirostris n. gen., n. sp., the fifth monachine described from the Pisco Formation (Peru). Coming from the Cerro la Bruja level at the locality of the same name, Magophoca n. gen. is the geologically oldest known seal from the Neogene of the southeast Pacific, dated at least to the late Tortonian, c. 8.4 Ma. Magophoca n. gen. is the second Monachinae (with Noriphoca gaudini) found to possess six upper incisors instead of four as in the other members of the sub-family. Further characters, such as the deep fossa for the m. triceps brachii caput mediale below the humeral head, on the posterior aspect of the proximal extremity of the diaphysis of the humerus, strongly support close relationships with Piscophoca from the latest Miocene and earliest Pliocene of the Pisco Formation at Sud Sacaco (Peru), but more interestingly, with Frisiphoca aberrata from the Tortonian of Belgium. In addition, the presence of an entepicondylar foramen is shared between Frisiphoca and Magophoca n. gen., but rare among other Monachinae, further strengthening the link between both. Although the fossil record of Frisiphoca aberrata is too incomplete to draw conclusions, these marked similarities allow us to hypothesize a dispersal link between both regions, across the late Miocene North Atlantic and Central American Seaway. The phylogenetic analysis retrieved Magophoca n. gen. as closely related to Hadrokirus and Piscophoca from younger levels in the Pisco Formation. This phylogenetic analysis also returned Kawas from the Miocene of Argentina as a sister genus of Homiphoca from the Pliocene of South Africa, thus radically departing from the previous classification of Kawas as a phocine seal. Article in Journal/Newspaper North Atlantic IRUA - Institutional Repository van de Universiteit Antwerpen Pacific Argentina Pisco ENVELOPE(-62.450,-62.450,-62.950,-62.950) Fossa ENVELOPE(9.795,9.795,62.990,62.990) Geodiversitas 46 3 |
institution |
Open Polar |
collection |
IRUA - Institutional Repository van de Universiteit Antwerpen |
op_collection_id |
ftunivantwerpen |
language |
English |
topic |
Biology |
spellingShingle |
Biology Dewaele, Leonard de Muizon, Christian A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
topic_facet |
Biology |
description |
Abstract: In the present study, we present a new monachine phocid, Magophoca brevirostris n. gen., n. sp., the fifth monachine described from the Pisco Formation (Peru). Coming from the Cerro la Bruja level at the locality of the same name, Magophoca n. gen. is the geologically oldest known seal from the Neogene of the southeast Pacific, dated at least to the late Tortonian, c. 8.4 Ma. Magophoca n. gen. is the second Monachinae (with Noriphoca gaudini) found to possess six upper incisors instead of four as in the other members of the sub-family. Further characters, such as the deep fossa for the m. triceps brachii caput mediale below the humeral head, on the posterior aspect of the proximal extremity of the diaphysis of the humerus, strongly support close relationships with Piscophoca from the latest Miocene and earliest Pliocene of the Pisco Formation at Sud Sacaco (Peru), but more interestingly, with Frisiphoca aberrata from the Tortonian of Belgium. In addition, the presence of an entepicondylar foramen is shared between Frisiphoca and Magophoca n. gen., but rare among other Monachinae, further strengthening the link between both. Although the fossil record of Frisiphoca aberrata is too incomplete to draw conclusions, these marked similarities allow us to hypothesize a dispersal link between both regions, across the late Miocene North Atlantic and Central American Seaway. The phylogenetic analysis retrieved Magophoca n. gen. as closely related to Hadrokirus and Piscophoca from younger levels in the Pisco Formation. This phylogenetic analysis also returned Kawas from the Miocene of Argentina as a sister genus of Homiphoca from the Pliocene of South Africa, thus radically departing from the previous classification of Kawas as a phocine seal. |
format |
Article in Journal/Newspaper |
author |
Dewaele, Leonard de Muizon, Christian |
author_facet |
Dewaele, Leonard de Muizon, Christian |
author_sort |
Dewaele, Leonard |
title |
A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
title_short |
A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
title_full |
A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
title_fullStr |
A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
title_full_unstemmed |
A new monachine seal (Monachinae, Phocidae, Mammalia) from the Miocene of Cerro La Bruja (Ica department, Peru) |
title_sort |
new monachine seal (monachinae, phocidae, mammalia) from the miocene of cerro la bruja (ica department, peru) |
publishDate |
2024 |
url |
https://hdl.handle.net/10067/2059970151162165141 https://repository.uantwerpen.be/docstore/d:irua:23742 |
long_lat |
ENVELOPE(-62.450,-62.450,-62.950,-62.950) ENVELOPE(9.795,9.795,62.990,62.990) |
geographic |
Pacific Argentina Pisco Fossa |
geographic_facet |
Pacific Argentina Pisco Fossa |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
1280-9659 Geodiversitas |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5252/GEODIVERSITAS2024V46A3 info:eu-repo/semantics/altIdentifier/isi/001207998700001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5252/GEODIVERSITAS2024V46A3 |
container_title |
Geodiversitas |
container_volume |
46 |
container_issue |
3 |
_version_ |
1802647753771188224 |