A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales
The evolutionary history of the beaked whales (Ziphiidae), odontocetes nowadays adapted to deep diving, is well known thanks to a significant fossil record mainly from the deep ocean floors. A partial cranium of a ziphiid recovered from Plio-Pleistocene deep sea deposits (about 1000 m) off the port...
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Online Access: | https://doi.org/10.4202/app.01076.2023 https://doaj.org/article/43c9cd023dc64c848dfb02af5e7d3ab8 |
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ftdoajarticles:oai:doaj.org/article:43c9cd023dc64c848dfb02af5e7d3ab8 2023-12-31T10:08:54+01:00 A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales Giovanni Bianucci Walter Sielfeld Nicole A. Olguin Guillermo Guzmán 2023-09-01T00:00:00Z https://doi.org/10.4202/app.01076.2023 https://doaj.org/article/43c9cd023dc64c848dfb02af5e7d3ab8 EN eng Institute of Paleobiology PAS https://www.app.pan.pl/archive/published/app68/app010762023.pdf https://doaj.org/toc/0567-7920 https://doaj.org/toc/1732-2421 doi:10.4202/app.01076.2023 0567-7920 1732-2421 https://doaj.org/article/43c9cd023dc64c848dfb02af5e7d3ab8 Acta Palaeontologica Polonica, Vol 68, Iss 3, Pp 477-491 (2023) mammalia cetacea ziphiidae cenozoic southeastern pacific south america Fossil man. Human paleontology GN282-286.7 Paleontology QE701-760 article 2023 ftdoajarticles https://doi.org/10.4202/app.01076.2023 2023-12-03T01:38:47Z The evolutionary history of the beaked whales (Ziphiidae), odontocetes nowadays adapted to deep diving, is well known thanks to a significant fossil record mainly from the deep ocean floors. A partial cranium of a ziphiid recovered from Plio-Pleistocene deep sea deposits (about 1000 m) off the port of Pisagua, northern Chile, during fishing activity is here described and referred to the new species Ihlengesi changoensis. Ihlengesi changoensis differs from the type species Ihlengesi saldanhae, from the sea floor off South Africa, by having a more elongated premaxillary sac fossa and consequently a more anteriorly located premaxillary foramen; dorsal margin of each premaxillary crest sloping markedly ventrolaterally and generating an acute dorsal profile of the vertex in anterior view; less anterolateral extension of the right nasal forming part of the premaxillary crest; lateral margins of the nasals not anteriorly diverging but weakly convex; nasofrontal suture anteriorly pointed. The phylogeny supports a sister-taxon relationship between I. changoensis and I. saldanhae, both members of the crown ziphiids Hyperoodontinae. Ihlengesi changoensis shares with I. saldanhae and other fossil ziphiids a small body size (estimated length 3.5 m) supporting the hypothesis that in the past small beaked whales (<4 m) were more common than today. Such recent shift of the ziphiids towards a larger size could be the result of a progressive change of diet from fish to cephalopods, to the competition with the delphinids, and the predatory impact of the white shark Carcharodon carcharias and/or of the killer whale Orcinus orca. This new Chilean ziphiid further supports the hypothesis that crown beaked whales originated and firstly dispersed in the oceanic waters of the Southern Hemisphere. Their radiation and geographical distribution could have been driven by the southern oceanic circulation and related localized concentration of trophic resources in high productivity upwelling areas. Article in Journal/Newspaper Killer Whale Orca Orcinus orca Killer whale Directory of Open Access Journals: DOAJ Articles Acta Palaeontologica Polonica 68 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
mammalia cetacea ziphiidae cenozoic southeastern pacific south america Fossil man. Human paleontology GN282-286.7 Paleontology QE701-760 |
spellingShingle |
mammalia cetacea ziphiidae cenozoic southeastern pacific south america Fossil man. Human paleontology GN282-286.7 Paleontology QE701-760 Giovanni Bianucci Walter Sielfeld Nicole A. Olguin Guillermo Guzmán A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
topic_facet |
mammalia cetacea ziphiidae cenozoic southeastern pacific south america Fossil man. Human paleontology GN282-286.7 Paleontology QE701-760 |
description |
The evolutionary history of the beaked whales (Ziphiidae), odontocetes nowadays adapted to deep diving, is well known thanks to a significant fossil record mainly from the deep ocean floors. A partial cranium of a ziphiid recovered from Plio-Pleistocene deep sea deposits (about 1000 m) off the port of Pisagua, northern Chile, during fishing activity is here described and referred to the new species Ihlengesi changoensis. Ihlengesi changoensis differs from the type species Ihlengesi saldanhae, from the sea floor off South Africa, by having a more elongated premaxillary sac fossa and consequently a more anteriorly located premaxillary foramen; dorsal margin of each premaxillary crest sloping markedly ventrolaterally and generating an acute dorsal profile of the vertex in anterior view; less anterolateral extension of the right nasal forming part of the premaxillary crest; lateral margins of the nasals not anteriorly diverging but weakly convex; nasofrontal suture anteriorly pointed. The phylogeny supports a sister-taxon relationship between I. changoensis and I. saldanhae, both members of the crown ziphiids Hyperoodontinae. Ihlengesi changoensis shares with I. saldanhae and other fossil ziphiids a small body size (estimated length 3.5 m) supporting the hypothesis that in the past small beaked whales (<4 m) were more common than today. Such recent shift of the ziphiids towards a larger size could be the result of a progressive change of diet from fish to cephalopods, to the competition with the delphinids, and the predatory impact of the white shark Carcharodon carcharias and/or of the killer whale Orcinus orca. This new Chilean ziphiid further supports the hypothesis that crown beaked whales originated and firstly dispersed in the oceanic waters of the Southern Hemisphere. Their radiation and geographical distribution could have been driven by the southern oceanic circulation and related localized concentration of trophic resources in high productivity upwelling areas. |
format |
Article in Journal/Newspaper |
author |
Giovanni Bianucci Walter Sielfeld Nicole A. Olguin Guillermo Guzmán |
author_facet |
Giovanni Bianucci Walter Sielfeld Nicole A. Olguin Guillermo Guzmán |
author_sort |
Giovanni Bianucci |
title |
A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
title_short |
A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
title_full |
A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
title_fullStr |
A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
title_full_unstemmed |
A new diminutive fossil ziphiid from the deep-sea floor off northern Chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
title_sort |
new diminutive fossil ziphiid from the deep-sea floor off northern chile and some remarks on the body size evolution and palaeobiogeography of the beaked whales |
publisher |
Institute of Paleobiology PAS |
publishDate |
2023 |
url |
https://doi.org/10.4202/app.01076.2023 https://doaj.org/article/43c9cd023dc64c848dfb02af5e7d3ab8 |
genre |
Killer Whale Orca Orcinus orca Killer whale |
genre_facet |
Killer Whale Orca Orcinus orca Killer whale |
op_source |
Acta Palaeontologica Polonica, Vol 68, Iss 3, Pp 477-491 (2023) |
op_relation |
https://www.app.pan.pl/archive/published/app68/app010762023.pdf https://doaj.org/toc/0567-7920 https://doaj.org/toc/1732-2421 doi:10.4202/app.01076.2023 0567-7920 1732-2421 https://doaj.org/article/43c9cd023dc64c848dfb02af5e7d3ab8 |
op_doi |
https://doi.org/10.4202/app.01076.2023 |
container_title |
Acta Palaeontologica Polonica |
container_volume |
68 |
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1786841844488863744 |