Dataset Information

Evidence for convergent evolution of ultrasonic hearing in toothed whales (Cetacea: Odontoceti).

ABSTRACT: Toothed whales (Cetacea: Odontoceti) are the most diverse group of modern cetaceans, originating during the Eocene/Oligocene transition approximately 38 Ma. All extant odontocetes echolocate; a single origin for this behaviour is supported by a unique facial source for ultrasonic vocalizations and a cochlea adapted for hearing the corresponding echoes. The craniofacial and inner ear morphology of Oligocene odontocetes support a rapid (less than 5 Myr) early evolution of echolocation. Although some cranial features in the stem odontocetes Simocetus and Olympicetus suggest an ability to generate ultrasonic sound, until now, the bony labyrinths of taxa of this grade have not been investigated. Here, we use µCT to examine a petrosal of a taxon with clear similarities to Olympicetus avitus. Measurements of the bony labyrinth, when added to an extensive dataset of cetartiodactyls, resulted in this specimen sharing a morphospace with stem whales, suggesting a transitional inner ear. This discovery implies that either the lineage leading to this Olympicetus--like taxon lost the ability to hear ultrasonic sound, or adaptations for ultrasonic hearing evolved twice, once in xenorophids and again on the stem of the odontocete crown group. We favour the latter interpretation as it matches a well-documented convergence of craniofacial morphology between xenorophids and extant odontocetes.

SUBMITTER: Racicot RA

PROVIDER: S-EPMC6548736 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Evidence for convergent evolution of ultrasonic hearing in toothed whales (Cetacea: Odontoceti).

Racicot Rachel A RA Boessenecker Robert W RW Darroch Simon A F SAF Geisler Jonathan H JH

Biology letters 20190501 5

Toothed whales (Cetacea: Odontoceti) are the most diverse group of modern cetaceans, originating during the Eocene/Oligocene transition approximately 38 Ma. All extant odontocetes echolocate; a single origin for this behaviour is supported by a unique facial source for ultrasonic vocalizations and a cochlea adapted for hearing the corresponding echoes. The craniofacial and inner ear morphology of Oligocene odontocetes support a rapid (less than 5 Myr) early evolution of echolocation. Although so ...[more]

PMID: 31088283

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Dataset Information

Evidence for convergent evolution of ultrasonic hearing in toothed whales (Cetacea: Odontoceti).

Publications

Evidence for convergent evolution of ultrasonic hearing in toothed whales (Cetacea: Odontoceti).

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