A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti)
Toothed whales (Odontoceti) are adapted for catching prey underwater and possess some of the most derived feeding specializations of all mammals, including the loss of milk teeth (monophyodonty), high tooth count (polydonty), and the loss of discrete tooth classes (homodonty). Many extant odontocete...
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ftdatacite:10.17605/osf.io/k94c7 2023-05-15T18:33:31+02:00 A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) Boessenecker, Robert Fraser, Danielle Churchill, Morgan Geisler, Jonathan 2017 https://dx.doi.org/10.17605/osf.io/k94c7 https://doi.org/10.31233/osf.io/k94c7 unknown PaleorXiv https://dx.doi.org/10.1098/rspb.2017.0531 CC-By Attribution 4.0 International Paleobiology Paleontology Vertebrate Paleobiology Vertebrate Paleontology Earth and Life Sciences Preprint Text article-journal ScholarlyArticle 2017 ftdatacite https://doi.org/10.17605/osf.io/k94c7 2021-11-05T12:55:41Z Toothed whales (Odontoceti) are adapted for catching prey underwater and possess some of the most derived feeding specializations of all mammals, including the loss of milk teeth (monophyodonty), high tooth count (polydonty), and the loss of discrete tooth classes (homodonty). Many extant odontocetes possess some combination of short, broad rostra, reduced tooth counts, fleshy lips, and enlarged hyoid bones - all adaptations for suction feeding upon fish and squid. We report a new fossil odontocete from the Oligocene (~30 Ma) of South Carolina (Inermorostrum xenops, gen. et sp. nov.) that possesses adaptations for suction feeding: toothlessness and a shortened rostrum (brevirostry). Enlarged foramina on the rostrum suggest the presence of enlarged lips or perhaps vibrissae. Phylogenetic analysis firmly places Inermorostrum within the Xenorophidae, an early diverging odontocete clade typified by long-snouted, heterodont dolphins. Inermorostrum is the earliest obligate suction feeder within the Odontoceti, a feeding mode that independently evolved several times within the clade. Analysis of macroevolutionary trends in rostral shape indicate stabilizing selection around an optimum rostral shape over the course of odontocete evolution, and a post-Eocene explosion in feeding morphology, heralding the diversity of feeding behaviour amongst modern Odontoceti. Report toothed whales DataCite Metadata Store (German National Library of Science and Technology) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Paleobiology Paleontology Vertebrate Paleobiology Vertebrate Paleontology Earth and Life Sciences |
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Paleobiology Paleontology Vertebrate Paleobiology Vertebrate Paleontology Earth and Life Sciences Boessenecker, Robert Fraser, Danielle Churchill, Morgan Geisler, Jonathan A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
topic_facet |
Paleobiology Paleontology Vertebrate Paleobiology Vertebrate Paleontology Earth and Life Sciences |
description |
Toothed whales (Odontoceti) are adapted for catching prey underwater and possess some of the most derived feeding specializations of all mammals, including the loss of milk teeth (monophyodonty), high tooth count (polydonty), and the loss of discrete tooth classes (homodonty). Many extant odontocetes possess some combination of short, broad rostra, reduced tooth counts, fleshy lips, and enlarged hyoid bones - all adaptations for suction feeding upon fish and squid. We report a new fossil odontocete from the Oligocene (~30 Ma) of South Carolina (Inermorostrum xenops, gen. et sp. nov.) that possesses adaptations for suction feeding: toothlessness and a shortened rostrum (brevirostry). Enlarged foramina on the rostrum suggest the presence of enlarged lips or perhaps vibrissae. Phylogenetic analysis firmly places Inermorostrum within the Xenorophidae, an early diverging odontocete clade typified by long-snouted, heterodont dolphins. Inermorostrum is the earliest obligate suction feeder within the Odontoceti, a feeding mode that independently evolved several times within the clade. Analysis of macroevolutionary trends in rostral shape indicate stabilizing selection around an optimum rostral shape over the course of odontocete evolution, and a post-Eocene explosion in feeding morphology, heralding the diversity of feeding behaviour amongst modern Odontoceti. |
format |
Report |
author |
Boessenecker, Robert Fraser, Danielle Churchill, Morgan Geisler, Jonathan |
author_facet |
Boessenecker, Robert Fraser, Danielle Churchill, Morgan Geisler, Jonathan |
author_sort |
Boessenecker, Robert |
title |
A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
title_short |
A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
title_full |
A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
title_fullStr |
A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
title_full_unstemmed |
A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti) |
title_sort |
toothless dwarf dolphin (odontoceti: xenorophidae) points to explosive feeding diversification of modern whales (neoceti) |
publisher |
PaleorXiv |
publishDate |
2017 |
url |
https://dx.doi.org/10.17605/osf.io/k94c7 https://doi.org/10.31233/osf.io/k94c7 |
genre |
toothed whales |
genre_facet |
toothed whales |
op_relation |
https://dx.doi.org/10.1098/rspb.2017.0531 |
op_rights |
CC-By Attribution 4.0 International |
op_doi |
https://doi.org/10.17605/osf.io/k94c7 |
_version_ |
1766218140282257408 |