A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru)
The modern sperm whales Kogia and Physeter (superfamily Physeteroidea) represent highly disparate, relict members of a group of odontocetes that peaked in diversity during the middle to late Miocene. Based on a highly informative specimen (including the cranium with ear bones, mandibles, teeth and s...
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Online Access: | http://hdl.handle.net/11568/1072844 https://doi.org/10.1080/14772019.2020.1805520 |
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ftunivpisairis:oai:arpi.unipi.it:11568/1072844 2024-04-14T08:20:08+00:00 A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) Lambert O. de Muizon C. Urbina M. Bianucci G. Lambert, O. de Muizon, C. Urbina, M. Bianucci, G. 2020 STAMPA http://hdl.handle.net/11568/1072844 https://doi.org/10.1080/14772019.2020.1805520 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000571520700003 volume:18 issue:20 firstpage:1707 lastpage:1742 numberofpages:36 journal:JOURNAL OF SYSTEMATIC PALAEONTOLOGY http://hdl.handle.net/11568/1072844 doi:10.1080/14772019.2020.1805520 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85091349277 info:eu-repo/semantics/closedAccess Burdigalian dental reduction functional morphology palaeobiology phylogeny stem Physeteroidea info:eu-repo/semantics/article 2020 ftunivpisairis https://doi.org/10.1080/14772019.2020.1805520 2024-03-21T19:18:52Z The modern sperm whales Kogia and Physeter (superfamily Physeteroidea) represent highly disparate, relict members of a group of odontocetes that peaked in diversity during the middle to late Miocene. Based on a highly informative specimen (including the cranium with ear bones, mandibles, teeth and some postcranial elements) from the lower Miocene (early Burdigalian, 19–18 Ma) of the Chilcatay Formation (Pisco Basin, Peru), we describe here a new genus and species of physeteroid, Rhaphicetus valenciae gen. et sp. nov. The latter is one of the geologically oldest physeteroids. This medium-sized species (estimated body length between 4.7 and 5.7 m) differs from all other physeteroids by the following, probably autapomorphic, features: a narrow, cylindrical rostrum comprising nearly 75% of the condylobasal length; the two main dorsal infraorbital foramina located posterior to the antorbital notch; an upper tooth count of at least 36 teeth per quadrant; and anterior-most upper alveoli filled by thick bony pads. Our phylogenetic analysis recovers R. valenciae as one of the earliest branching stem physeteroids. The highly unusual filling of the anterior upper alveoli by bony pads is interpreted as part of a mechanism leading to the loss of apical and subapical upper teeth. By comparison with other odontocetes displaying some degree of anterior reduction of the dentition, this condition may have corresponded to the rostrum being anteriorly longer than the mandible. The elongated rostrum with a circular cross-section, the long temporal fossa, and the high number of slender, pointed upper and lower teeth all suggest that R. valenciae used its dentition to grasp relatively small prey, possibly via rapid movements of the head. On the one hand, this new Peruvian record increases our knowledge of the morphological disparity of sperm whales during the Miocene. On the other hand, it may provide clues to the ancestral morphotype for all physeteroids. ... Article in Journal/Newspaper Sperm whale ARPI - Archivio della Ricerca dell'Università di Pisa Fossa ENVELOPE(9.795,9.795,62.990,62.990) Pisco ENVELOPE(-62.450,-62.450,-62.950,-62.950) Journal of Systematic Palaeontology 18 20 1707 1742 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
topic |
Burdigalian dental reduction functional morphology palaeobiology phylogeny stem Physeteroidea |
spellingShingle |
Burdigalian dental reduction functional morphology palaeobiology phylogeny stem Physeteroidea Lambert O. de Muizon C. Urbina M. Bianucci G. A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
topic_facet |
Burdigalian dental reduction functional morphology palaeobiology phylogeny stem Physeteroidea |
description |
The modern sperm whales Kogia and Physeter (superfamily Physeteroidea) represent highly disparate, relict members of a group of odontocetes that peaked in diversity during the middle to late Miocene. Based on a highly informative specimen (including the cranium with ear bones, mandibles, teeth and some postcranial elements) from the lower Miocene (early Burdigalian, 19–18 Ma) of the Chilcatay Formation (Pisco Basin, Peru), we describe here a new genus and species of physeteroid, Rhaphicetus valenciae gen. et sp. nov. The latter is one of the geologically oldest physeteroids. This medium-sized species (estimated body length between 4.7 and 5.7 m) differs from all other physeteroids by the following, probably autapomorphic, features: a narrow, cylindrical rostrum comprising nearly 75% of the condylobasal length; the two main dorsal infraorbital foramina located posterior to the antorbital notch; an upper tooth count of at least 36 teeth per quadrant; and anterior-most upper alveoli filled by thick bony pads. Our phylogenetic analysis recovers R. valenciae as one of the earliest branching stem physeteroids. The highly unusual filling of the anterior upper alveoli by bony pads is interpreted as part of a mechanism leading to the loss of apical and subapical upper teeth. By comparison with other odontocetes displaying some degree of anterior reduction of the dentition, this condition may have corresponded to the rostrum being anteriorly longer than the mandible. The elongated rostrum with a circular cross-section, the long temporal fossa, and the high number of slender, pointed upper and lower teeth all suggest that R. valenciae used its dentition to grasp relatively small prey, possibly via rapid movements of the head. On the one hand, this new Peruvian record increases our knowledge of the morphological disparity of sperm whales during the Miocene. On the other hand, it may provide clues to the ancestral morphotype for all physeteroids. ... |
author2 |
Lambert, O. de Muizon, C. Urbina, M. Bianucci, G. |
format |
Article in Journal/Newspaper |
author |
Lambert O. de Muizon C. Urbina M. Bianucci G. |
author_facet |
Lambert O. de Muizon C. Urbina M. Bianucci G. |
author_sort |
Lambert O. |
title |
A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
title_short |
A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
title_full |
A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
title_fullStr |
A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
title_full_unstemmed |
A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru) |
title_sort |
new longirostrine sperm whale (cetacea, physeteroidea) from the lower miocene of the pisco basin (southern coast of peru) |
publishDate |
2020 |
url |
http://hdl.handle.net/11568/1072844 https://doi.org/10.1080/14772019.2020.1805520 |
long_lat |
ENVELOPE(9.795,9.795,62.990,62.990) ENVELOPE(-62.450,-62.450,-62.950,-62.950) |
geographic |
Fossa Pisco |
geographic_facet |
Fossa Pisco |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000571520700003 volume:18 issue:20 firstpage:1707 lastpage:1742 numberofpages:36 journal:JOURNAL OF SYSTEMATIC PALAEONTOLOGY http://hdl.handle.net/11568/1072844 doi:10.1080/14772019.2020.1805520 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85091349277 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1080/14772019.2020.1805520 |
container_title |
Journal of Systematic Palaeontology |
container_volume |
18 |
container_issue |
20 |
container_start_page |
1707 |
op_container_end_page |
1742 |
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