Amphibian teeth: current knowledge, unanswered questions, and some directions for future research

Davit-Béal, Tiphaine; Chisaka, Hideki; Delgado, Sidney; Sire, Jean‐Yves

doi:10.1111/j.1469-185x.2006.00003.x

Cited by 61 publications

(52 citation statements)

References 160 publications

(312 reference statements)

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“…In the few toothed amphibian species that have been studied a dental lamina has been observed extending on the lingual side of the functional tooth from which the next tooth develops [38,[40][41][42]. The dental lamina is continuous with the oral epithelium and appears at a slight distance from the functional tooth, which was proposed to have detached from the lamina during calcification stages [42].…”

Section: Amphibiansmentioning

confidence: 99%

Evolution and developmental diversity of tooth regeneration

Tucker

Fraser

2014

Seminars in Cell & Developmental Biology

123

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a b s t r a c tThis review considers the diversity observed during both the development and evolution of tooth replacement throughout the vertebrates in a phylogenetic framework from basal extant chondrichthyan fish and more derived teleost fish to mammals. We illustrate the conservation of the tooth regeneration process among vertebrate clades, where tooth regeneration refers to multiple tooth successors formed de novo for each tooth position in the jaws from a common set of retained dental progenitor cells. We discuss the conserved genetic mechanisms that might be modified to promote morphological diversity in replacement dentitions. We review current research and recent progress in this field during the last decade that have promoted our understanding of tooth diversity in an evolutionary developmental context, and show how tooth replacement and dental regeneration have impacted the evolution of the tooth-jaw module in vertebrates.

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Section: Amphibiansmentioning

confidence: 99%

Evolution and developmental diversity of tooth regeneration

Tucker

Fraser

2014

Seminars in Cell & Developmental Biology

123

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“…These hard tissues, although similar when well mineralized, differ in the structure and organization of their organic matrix prior to mineralization and maturation and are differently distributed within vertebrate lineages. Enameloids are present in chondrichthyans (sharks and rays: Sasagawa 2002), actinopterygians (bony fish: Shellis and Miles 1976;Sasagawa 1988) and early larval stages of caudate amphibians (newts and salamanders : Chibon 1970; see review in Davit-Béal et al 2006a). Prismatic enamels are found in mammals (Koenigswald 1997), whereas prismless enamels exist in reptiles (Sander 2001), adult amphibians (Schmidt 1970;Spinelli and Chibon 1978) including the neotenic axolotl (Bolte and Clemen 1992) and lungfish (Smith 1992;Kemp 2002).…”

Section: Introductionmentioning

confidence: 98%

Enameloid/enamel transition through successive tooth replacements in Pleurodeles waltl (Lissamphibia, Caudata)

Davit-Béal

Allizard

2006

Cell Tissue Res

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Study of the evolutionary enameloid/enamel transition suffers from discontinuous data in the fossil record, although a developmental enameloid/enamel transition exists in living caudates, salamanders and newts. The timing and manner in which the enameloid/enamel transition is achieved during caudate ontogeny is of great interest, because the caudate situation could reflect events that have occurred during evolution. Using light and transmission electron microscopy, we have monitored the formation of the upper tooth region in six successive teeth of a tooth family (position I) in Pleurodeles waltl from late embryos to young adult. Enameloid has only been identified in embryonic tooth I(1) and in larval teeth I(2) and I(3). A thin layer of enamel is deposited later by ameloblasts on the enameloid surface of these teeth. From post-metamorphic juvenile onwards, teeth are covered with enamel only. The collagen-rich enameloid matrix is deposited by odontoblasts, which subsequently form dentin. Enameloid, like enamel, mineralizes and then matures but ameloblast participation in enameloid matrix deposition has not been established. From tooth I(1) to tooth I(3), the enameloid matrix becomes ever more dense and increasingly comes to resemble the dentin matrix, although it is still subjected to maturation. Our data suggest the absence of an enameloid/enamel transition and, instead, the occurrence of an enameloid/dentin transition, which seems to result from a progressive slowing down of odontoblast activity. As a consequence, the ameloblasts in post-metamorphic teeth appear to synthesize the enamel matrix earlier than in larval teeth.

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“…The majority of these features are based in soft tissue anatomy, and thus not observable in the fossil record. However, two features, pedicellate teeth (where the cusp and base of the tooth are separated by a ''dividing zone'' of poorly ossified matrix; see (Davit-Beal et al 2007) for a recent review of this feature) and the operculum-opercularis complex of the middle ear (the operculum is a bone that sits in the fenestra vestibuli in articulation with the footplate of the stapes in the middle ear) are based on hard tissues and are unique to at least some lissamphibians (extant caecilians, lacking a pectoral girdle, do not have an operculum, but see below). A third feature, the presence of an unique patch of sensory tissue in the inner ear known as the amphibian papilla, may also have an osseous correlate (Sigurdsen 2008).…”

Section: Introductionmentioning

confidence: 99%

Focal Review: The Origin(s) of Modern Amphibians

Anderson

2008

Evol Biol

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The recent description of the stem batrachian Gerobatrachus has changed the terms of the ongoing debate on the origin of extant amphibians (Lissamphibia: frogs, salamanders, and the limbless caecilians). This important fossil, through a shared mosaic of unique derived salientian and urodele characters, links frogs and salamanders with an archaic group of fossil amphibians known as amphibamid temnospondyls. The present paper reviews the impact of this fossil on morphological and molecular phylogenies, and divergence timing estimates based on molecular models and the fossil record. In morphology, most recent efforts have focused on better characterizing the anatomy and relationships of amphibamid temnospondyls. Progress has also been made with the complete description of the earliest caecilian Eocaecilia; however, the question of caecilian origins remains unresolved at present. The large scale phylogenetic analyses all agree on the overall tetrapod tree phylogenetic structure, and the largest analyses agree that the origin of at least frogs and salamanders among fossils from family Amphibamidae. Conversely, all molecular based analyses find a monophyletic Lissamphibia, and a Batrachia terminal dichotomy, which raises questions over either the validity of morphological analyses that support lissamphibian polyphyly or about the possibility of long branch attraction given the short internal divergences and long subsequent branches. Paradoxically, the estimated date of the lissamphibian divergence best matches the fossil record if timed to the split between lepospondyls and temnospondyls. Future research should focus on development and fine details of cranial anatomy of fossil and extant amphibians to produce new evidence and clarity into the question of lissamphibian, and especially caecilian, origins.

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Amphibian teeth: current knowledge, unanswered questions, and some directions for future research

Cited by 61 publications

References 160 publications

Evolution and developmental diversity of tooth regeneration

Evolution and developmental diversity of tooth regeneration

Enameloid/enamel transition through successive tooth replacements in Pleurodeles waltl (Lissamphibia, Caudata)

Focal Review: The Origin(s) of Modern Amphibians

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