The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina
"River dolphins" are a paraphyletic group of toothed whales (Odontoceti) that represent independent secondary invasions of freshwater habitats. Different "river dolphin" lineages display suites of convergent morphological specializations that commonly reflect adaptations to river...
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ftsmithonian:oai:repository.si.edu:10088/25223 2023-05-15T18:33:31+02:00 The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina Gutstein, Carolina Simon Cozzuol, Mario Alberto Pyenson, Nicholas D. 2014 http://hdl.handle.net/10088/25223 https://doi.org/10.1002/ar.22901 unknown Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology Gutstein, Carolina Simon, Cozzuol, Mario Alberto, and Pyenson, Nicholas D. 2014. "The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina." Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology . 297 (6):1096–1102. https://doi.org/10.1002/ar.22901 1932-8486 http://hdl.handle.net/10088/25223 118977 doi:10.1002/ar.22901 Journal Article 2014 ftsmithonian https://doi.org/10.1002/ar.22901 2020-09-09T18:34:33Z "River dolphins" are a paraphyletic group of toothed whales (Odontoceti) that represent independent secondary invasions of freshwater habitats. Different "river dolphin" lineages display suites of convergent morphological specializations that commonly reflect adaptations to riverine and freshwater environments, such as longirostry, reduced orbits, and wide, paddle-like flippers. One lineage, the Iniidae, is presently endemic to South America, and includes several extinct Neogene taxa along with their sole extant genus, Inia (the Amazon River dolphin). We report here a humerus recovered from the late Miocene deposits of the Ituzaingó Formation in the Paraná Basin of Argentina. The specimen exhibits diagnostic features of the family Iniidae, including a scapular-sternal joint of the humerus, which is a unique anatomical connection among mammals. This joint permits enhanced parasagittal adduction of the flipper as a control surface, relative to other odontocetes, providing Inia with a high degree of maneuverability in its structurally complex and heterogenous riverine habitat. This unique anatomical connection, here documented from the late Miocene (~9 million years-6.5 million years old), not only provides the oldest diagnostic record for Iniidae, but it also indicates a similar habitat use for this lineage, a finding coincident with the current paleoenvironmental interpretation for the Ituzaingó Formation. Anat Rec, 2014. © 2014 Wiley Periodicals, Inc. NH-Paleobiology NMNH Peer-reviewed Article in Journal/Newspaper toothed whales Unknown Argentina Ituzaingó ENVELOPE(-65.817,-65.817,-66.000,-66.000) The Anatomical Record 297 6 1096 1102 |
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Open Polar |
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ftsmithonian |
language |
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description |
"River dolphins" are a paraphyletic group of toothed whales (Odontoceti) that represent independent secondary invasions of freshwater habitats. Different "river dolphin" lineages display suites of convergent morphological specializations that commonly reflect adaptations to riverine and freshwater environments, such as longirostry, reduced orbits, and wide, paddle-like flippers. One lineage, the Iniidae, is presently endemic to South America, and includes several extinct Neogene taxa along with their sole extant genus, Inia (the Amazon River dolphin). We report here a humerus recovered from the late Miocene deposits of the Ituzaingó Formation in the Paraná Basin of Argentina. The specimen exhibits diagnostic features of the family Iniidae, including a scapular-sternal joint of the humerus, which is a unique anatomical connection among mammals. This joint permits enhanced parasagittal adduction of the flipper as a control surface, relative to other odontocetes, providing Inia with a high degree of maneuverability in its structurally complex and heterogenous riverine habitat. This unique anatomical connection, here documented from the late Miocene (~9 million years-6.5 million years old), not only provides the oldest diagnostic record for Iniidae, but it also indicates a similar habitat use for this lineage, a finding coincident with the current paleoenvironmental interpretation for the Ituzaingó Formation. Anat Rec, 2014. © 2014 Wiley Periodicals, Inc. NH-Paleobiology NMNH Peer-reviewed |
format |
Article in Journal/Newspaper |
author |
Gutstein, Carolina Simon Cozzuol, Mario Alberto Pyenson, Nicholas D. |
spellingShingle |
Gutstein, Carolina Simon Cozzuol, Mario Alberto Pyenson, Nicholas D. The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
author_facet |
Gutstein, Carolina Simon Cozzuol, Mario Alberto Pyenson, Nicholas D. |
author_sort |
Gutstein, Carolina Simon |
title |
The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
title_short |
The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
title_full |
The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
title_fullStr |
The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
title_full_unstemmed |
The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina |
title_sort |
antiquity of riverine adaptations in iniidae (cetacea, odontoceti) documented by a humerus from the late miocene of the ituzaingó formation, argentina |
publishDate |
2014 |
url |
http://hdl.handle.net/10088/25223 https://doi.org/10.1002/ar.22901 |
long_lat |
ENVELOPE(-65.817,-65.817,-66.000,-66.000) |
geographic |
Argentina Ituzaingó |
geographic_facet |
Argentina Ituzaingó |
genre |
toothed whales |
genre_facet |
toothed whales |
op_relation |
Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology Gutstein, Carolina Simon, Cozzuol, Mario Alberto, and Pyenson, Nicholas D. 2014. "The Antiquity of Riverine Adaptations in Iniidae (Cetacea, Odontoceti) Documented by a Humerus from the Late Miocene of the Ituzaingó Formation, Argentina." Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology . 297 (6):1096–1102. https://doi.org/10.1002/ar.22901 1932-8486 http://hdl.handle.net/10088/25223 118977 doi:10.1002/ar.22901 |
op_doi |
https://doi.org/10.1002/ar.22901 |
container_title |
The Anatomical Record |
container_volume |
297 |
container_issue |
6 |
container_start_page |
1096 |
op_container_end_page |
1102 |
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1766218144985120768 |