Bibliography Record
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Hautier, Lionel; Helder Gomes Rodrigues; Sergio Ferreira-Cardoso; Christopher A. Emerling; Marie-Lou Porcher; Robert J. Asher; Roberto Portela Miguez; Frederic Delsuc
(detail)
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2023a |
From teeth to pad: tooth loss and development of keratinous structures in sirenians.
Proceedings of the Royal Society B. Royal Society Publishing. Org. https://doi.org/10.1098/rspb.2023.1932 Nov. 29, 2023.
–ABSTRACT: Sirenians are a well-known example of morphological adaptation to a shallow-water grazing diet characterized by a modified feeding apparatus and orofacial morphology. Such adaptations were accompanied by an anterior tooth reduction associated with the development of keratinized pads, the evolution of which remains elusive. Among sirenians, the recently extinct Steller's sea cow represents a special case for being completely toothless. Here, we used ?-CT scans of sirenian crania to understand how motor-sensor systems associated with tooth innervation responded to innovations such as keratinized pads and continuous dental replacement. In addition, we surveyed nine genes associated with dental reduction for signatures of loss of function. Our results reveal how patterns of innervation changed with modifications of the dental formula, especially continuous replacement in manatees. Both our morphological and genomic data show that dental development was not completely lost in the edentulous Steller's sea cows. By tracing the phylogenetic history of tooth innervation, we illustrate the role of development in promoting the innervation of keratinized pads, similar to the secondary use of dental canals for innervating neomorphic keratinized structures in other tetrapod groups.
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Related Index Records (5)
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Anatomy
(SEE ALSO: Brain and Nervous System; Circulatory System; Digestive System; Embryology; Endocrinology; Growth Rates; Histology; Myology; Pathology; Respiratory System; Skeleton; Urogenital System; and under species)
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2023a |
Hautier, L; Gomes Rodrigues; et al. (development of keratinous structures) |
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Brain and Nervous System
(SEE ALSO: Sense Organs)
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2023a |
Hautier, L; Gomes Rodrigues; et al. (innervation of teeth and keratinous pads) |
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Embryology and Ontogeny
(SEE ALSO: Age Determination; Growth Rates; Teratology)
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2023a |
Hautier, L; Gomes Rodrigues; et al. (development of teeth and keratinous pads) |
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Genetics
(SEE ALSO: Phylogeny and Affinities)
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2023a |
Hautier, L; Gomes Rodrigues; et al. (genomic control of development of keratinous pads) |
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Mastication
(SEE ALSO: Behavior, Ingestive)
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2023a |
Hautier, L; Gomes Rodrigues; et al. (tooth loss and development of keratinous pads) |
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