A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru
On the basis of a partial odontocete (toothed whale) skeleton (complete skull with associated ear bones, mandible, teeth, hyoid bones, and cervical vertebrae) from the middle Miocene (ca. 14-12 Ma) levels of the Pisco Formation at Cerro los Quesos, Pisco-Ica desert, southern coast of Peru, a new gen...
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ftunivpisairis:oai:arpi.unipi.it:11568/133259 2024-04-21T08:12:47+00:00 A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru Lambert O. Post K. BIANUCCI, GIOVANNI Lambert, O. Bianucci, Giovanni Post, K. 2009 STAMPA http://hdl.handle.net/11568/133259 eng eng info:eu-repo/semantics/altIdentifier/wos/000269845900022 volume:29(3) firstpage:910 lastpage:922 numberofpages:13 journal:JOURNAL OF VERTEBRATE PALEONTOLOGY http://hdl.handle.net/11568/133259 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-77649087317 Cetacea Ziphiidae Peru Miocene info:eu-repo/semantics/article 2009 ftunivpisairis 2024-03-28T01:25:15Z On the basis of a partial odontocete (toothed whale) skeleton (complete skull with associated ear bones, mandible, teeth, hyoid bones, and cervical vertebrae) from the middle Miocene (ca. 14-12 Ma) levels of the Pisco Formation at Cerro los Quesos, Pisco-Ica desert, southern coast of Peru, a new genus and species of beaked whale (Ziphiidae), Nazcacetus urbinai, is described. This small ziphiid, the best documented fossil species to date, is characterized by a strong reduction of the upper and lower dentitions except for a pair of large apical mandibular teeth, a Tasmacetus-like vertex, a short mandibular symphysis, and the abrupt elevation of the dorsal margin of the mandible towards the coronoid process. A phylogenetic analysis indicates that Nazcacetus is a crown ziphiid, in a more crownward position than Berardiinae and Tasmacetus, but branching before the Hyperoodontinae and Ziphiinae lineages. Several morphological traits observed in Nazcacetus, including the reduction of teeth, the small temporal fossa, and the large hamular process, suggest that this taxon possessed the suction feeding capacities of Recent ziphiids, a specialization possibly related to the exploitation by the early ziphiids of a new ecological niche. The presence of large apical teeth on the mandible of Nazcacetus, a character highly dimorphic in recent ziphiids, might indicate that sexual dimorphism was already present as early in ziphiid evolutionary history as the middle Miocene, a hypothesis supported by the nested position of Nazcacetus in the ziphiid phylogenetic tree. Article in Journal/Newspaper toothed whale ARPI - Archivio della Ricerca dell'Università di Pisa |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
Cetacea Ziphiidae Peru Miocene |
spellingShingle |
Cetacea Ziphiidae Peru Miocene Lambert O. Post K. BIANUCCI, GIOVANNI A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
topic_facet |
Cetacea Ziphiidae Peru Miocene |
description |
On the basis of a partial odontocete (toothed whale) skeleton (complete skull with associated ear bones, mandible, teeth, hyoid bones, and cervical vertebrae) from the middle Miocene (ca. 14-12 Ma) levels of the Pisco Formation at Cerro los Quesos, Pisco-Ica desert, southern coast of Peru, a new genus and species of beaked whale (Ziphiidae), Nazcacetus urbinai, is described. This small ziphiid, the best documented fossil species to date, is characterized by a strong reduction of the upper and lower dentitions except for a pair of large apical mandibular teeth, a Tasmacetus-like vertex, a short mandibular symphysis, and the abrupt elevation of the dorsal margin of the mandible towards the coronoid process. A phylogenetic analysis indicates that Nazcacetus is a crown ziphiid, in a more crownward position than Berardiinae and Tasmacetus, but branching before the Hyperoodontinae and Ziphiinae lineages. Several morphological traits observed in Nazcacetus, including the reduction of teeth, the small temporal fossa, and the large hamular process, suggest that this taxon possessed the suction feeding capacities of Recent ziphiids, a specialization possibly related to the exploitation by the early ziphiids of a new ecological niche. The presence of large apical teeth on the mandible of Nazcacetus, a character highly dimorphic in recent ziphiids, might indicate that sexual dimorphism was already present as early in ziphiid evolutionary history as the middle Miocene, a hypothesis supported by the nested position of Nazcacetus in the ziphiid phylogenetic tree. |
author2 |
Lambert, O. Bianucci, Giovanni Post, K. |
format |
Article in Journal/Newspaper |
author |
Lambert O. Post K. BIANUCCI, GIOVANNI |
author_facet |
Lambert O. Post K. BIANUCCI, GIOVANNI |
author_sort |
Lambert O. |
title |
A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
title_short |
A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
title_full |
A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
title_fullStr |
A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
title_full_unstemmed |
A new beaked whale (Odontoceti, Ziphiidae) from the middle Miocene of Peru |
title_sort |
new beaked whale (odontoceti, ziphiidae) from the middle miocene of peru |
publishDate |
2009 |
url |
http://hdl.handle.net/11568/133259 |
genre |
toothed whale |
genre_facet |
toothed whale |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000269845900022 volume:29(3) firstpage:910 lastpage:922 numberofpages:13 journal:JOURNAL OF VERTEBRATE PALEONTOLOGY http://hdl.handle.net/11568/133259 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-77649087317 |
_version_ |
1796932971310088192 |