EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM
Among the many hyper-longirostrine dolphins (Odontoceti) from the Miocene, members of the family Eurhinodelphinidae bear two highly distinctive cranial features: a long and edentulous premaxillary portion of the rostrum and a mandible that is significantly shorter than the rostrum. Until now, unambi...
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Milano University Press
2021
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ftdoajarticles:oai:doaj.org/article:b38e31228c114a0c863abd3a9e4184c9 2023-10-01T03:57:49+02:00 EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM OLIVIER LAMBERT CHRISTIAN DE MUIZON RAFAEL M. VARAS-MALCA MARIO URBINA GIOVANNI BIANUCCI 2021-01-01T00:00:00Z https://doi.org/10.13130/2039-4942/15124 https://doaj.org/article/b38e31228c114a0c863abd3a9e4184c9 EN eng Milano University Press https://riviste.unimi.it/index.php/RIPS/article/view/15124 https://doaj.org/toc/0035-6883 https://doaj.org/toc/2039-4942 doi:10.13130/2039-4942/15124 0035-6883 2039-4942 https://doaj.org/article/b38e31228c114a0c863abd3a9e4184c9 Rivista Italiana di Paleontologia e Stratigrafia, Vol 127, Iss 1 (2021) Cetacea Odontoceti Eurhinodelphinidae Chilcatay Formation Burdigalian southeastern Pacific Geology QE1-996.5 Paleontology QE701-760 article 2021 ftdoajarticles https://doi.org/10.13130/2039-4942/15124 2023-09-03T00:47:43Z Among the many hyper-longirostrine dolphins (Odontoceti) from the Miocene, members of the family Eurhinodelphinidae bear two highly distinctive cranial features: a long and edentulous premaxillary portion of the rostrum and a mandible that is significantly shorter than the rostrum. Until now, unambiguously attributed members of this clade were only recorded from early to middle Miocene deposits of the North Atlantic realm (east coast U.S.A., North Sea Basin, and Mediterranean). In this work we describe and compare two partial skulls of longirostrine dolphins from late early Miocene (Burdigalian, 19.25-18 Ma) marine deposits of the Chilcatay Formation, in the East Pisco Basin (southern coast of Peru), preserving rostral and mandibular material, as well as ear bones. Based on these specimens we report diagnostic remains attributable to this family for the first time for the whole Southern Hemisphere and the whole Pacific Ocean. This major expansion of eurhinodelphinids' palaeogeographic distribution contrasts with their proposed shallow-water, coastal environments; it suggests a new dispersal route for members of the family across the Central American Seaway; and it further highlights the similarities between the odontocete faunas of the southeastern Pacific and North Atlantic realm during the Miocene. Better-preserved eurhinodelphinid specimens from the odontocete-rich Chilcatay Formation will allow for a more detailed comparison with North Atlantic members of the family. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Pacific Pisco ENVELOPE(-62.450,-62.450,-62.950,-62.950) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Cetacea Odontoceti Eurhinodelphinidae Chilcatay Formation Burdigalian southeastern Pacific Geology QE1-996.5 Paleontology QE701-760 |
spellingShingle |
Cetacea Odontoceti Eurhinodelphinidae Chilcatay Formation Burdigalian southeastern Pacific Geology QE1-996.5 Paleontology QE701-760 OLIVIER LAMBERT CHRISTIAN DE MUIZON RAFAEL M. VARAS-MALCA MARIO URBINA GIOVANNI BIANUCCI EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
topic_facet |
Cetacea Odontoceti Eurhinodelphinidae Chilcatay Formation Burdigalian southeastern Pacific Geology QE1-996.5 Paleontology QE701-760 |
description |
Among the many hyper-longirostrine dolphins (Odontoceti) from the Miocene, members of the family Eurhinodelphinidae bear two highly distinctive cranial features: a long and edentulous premaxillary portion of the rostrum and a mandible that is significantly shorter than the rostrum. Until now, unambiguously attributed members of this clade were only recorded from early to middle Miocene deposits of the North Atlantic realm (east coast U.S.A., North Sea Basin, and Mediterranean). In this work we describe and compare two partial skulls of longirostrine dolphins from late early Miocene (Burdigalian, 19.25-18 Ma) marine deposits of the Chilcatay Formation, in the East Pisco Basin (southern coast of Peru), preserving rostral and mandibular material, as well as ear bones. Based on these specimens we report diagnostic remains attributable to this family for the first time for the whole Southern Hemisphere and the whole Pacific Ocean. This major expansion of eurhinodelphinids' palaeogeographic distribution contrasts with their proposed shallow-water, coastal environments; it suggests a new dispersal route for members of the family across the Central American Seaway; and it further highlights the similarities between the odontocete faunas of the southeastern Pacific and North Atlantic realm during the Miocene. Better-preserved eurhinodelphinid specimens from the odontocete-rich Chilcatay Formation will allow for a more detailed comparison with North Atlantic members of the family. |
format |
Article in Journal/Newspaper |
author |
OLIVIER LAMBERT CHRISTIAN DE MUIZON RAFAEL M. VARAS-MALCA MARIO URBINA GIOVANNI BIANUCCI |
author_facet |
OLIVIER LAMBERT CHRISTIAN DE MUIZON RAFAEL M. VARAS-MALCA MARIO URBINA GIOVANNI BIANUCCI |
author_sort |
OLIVIER LAMBERT |
title |
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
title_short |
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
title_full |
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
title_fullStr |
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
title_full_unstemmed |
EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM |
title_sort |
eurhinodelphinids from the early miocene of peru: first unambiguous records of these hyper-longirostrine dolphins outside the north atlantic realm |
publisher |
Milano University Press |
publishDate |
2021 |
url |
https://doi.org/10.13130/2039-4942/15124 https://doaj.org/article/b38e31228c114a0c863abd3a9e4184c9 |
long_lat |
ENVELOPE(-62.450,-62.450,-62.950,-62.950) |
geographic |
Pacific Pisco |
geographic_facet |
Pacific Pisco |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Rivista Italiana di Paleontologia e Stratigrafia, Vol 127, Iss 1 (2021) |
op_relation |
https://riviste.unimi.it/index.php/RIPS/article/view/15124 https://doaj.org/toc/0035-6883 https://doaj.org/toc/2039-4942 doi:10.13130/2039-4942/15124 0035-6883 2039-4942 https://doaj.org/article/b38e31228c114a0c863abd3a9e4184c9 |
op_doi |
https://doi.org/10.13130/2039-4942/15124 |
_version_ |
1778529895060602880 |