Presence of plicidentine in the oral teeth of the coelacanth Latimeria chalumnae Smith 1939 (Sarcopterygii; Actinistia)

Meunier, François; Mondéjar‐Fernández, Jorge; Goussard, Florent; Clément, Gérard; Herbin, Marc

doi:10.1016/j.jsb.2015.02.005

Cited by 20 publications

(22 citation statements)

References 25 publications

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“…The plicidentine folds of Amia and Polypterus are different from those of polyplocodont plicidentine of Lepisosteidae the pulpar folds of which are reinforced in their centre by the tooth enamel (Meunier & Brito, ; Schultze, , ), and that fill a great part of the pulp cavity (Meunier & Brito, ). Conversely, the relative simplicity of the folds observed in both presently studied taxa resembles closely the simplexodont plicidentine described in various teleostean fishes (Germain et al., ; Meunier, ; Meunier et al., ; Meunier, De Mayrinck, et al., ), as well as in the caniniform teeth of Latimeria chalumnae , a Sarcopterygii (Meunier, Mondejar‐Fernandes, Goussard, Clément, & Herbin, ).…”

Section: Discussion‐conclusionsupporting

confidence: 74%

Teeth of extant Polypteridae and Amiidae have plicidentine organization

Germain

Meunier

2017

Acta Zoologica

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The study of teeth of the lower jaws of Amia calva and Polypterus senegalus, with non -destructive X-ray tomography, has revealed that there are dentine folds in the tooth pulp cavity in both species. These folds are simple and present only in the base of the pulp cavity where they strengthen the fixation of teeth on the jaw. So the teeth of these two basal actinopterygian taxa have a simplexodont type of plicidentine like the extinct †Cheirolepis and various extant teleostean predators, whereas the extant Lepisosteids, the sister group of Amiidae, have polyplocodont plicidentine. The phylogenetic/adaptive significance of this simplexodont plicidentine is discussed. K E Y W O R D S

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Section: Discussion‐conclusionsupporting

confidence: 74%

Teeth of extant Polypteridae and Amiidae have plicidentine organization

Germain

Meunier

2017

Acta Zoologica

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“…Plicidentine, defined as infoldings of the dentine into the pulp cavity at the base of the tooth, has long been known in early tetrapods, being first documented in the temnospondyl Mastodonsaurus by Owen (1841) . It has since been found to be widespread throughout numerous temnospondyls (often referred to as ‘labyrinthine infoldings’ in older literature) but is also known in a variety of extinct and extant fishes (e.g., Schultze, 1969 ; Schultze, 1970 ; Long, 1989 ; Meunier et al, 2015 ). Although the classical model of dental evolution suggested a loss of plicidentine in amniotes (e.g., Laurin & Reisz, 1995 ), these infoldings occur in a broad number of amniote groups, including ichthyosaurs ( Maxwell, Caldwell & Lamoureux, 2011b ), choristoderes ( Gao & Fox, 1998 ), lepidosaurs (e.g., Kearney, Rieppel & Wood, 2006 ; Maxwell et al, 2011 ), captorhinids ( De Ricqlès & Bolt, 1983 ), parareptiles (e.g., Modesto & Reisz, 2008 ; MacDougall, LeBlanc & Reisz, 2014 ; MacDougall, Modesto & Reisz, 2016 ), and synapsids ( Brink, LeBlanc & Reisz, 2014 ).…”

Section: Descriptionmentioning

confidence: 99%

Histological characterization of denticulate palatal plates in an Early Permian dissorophoid

Gee

Haridy

Reisz

2017

PeerJ

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Denticles are small, tooth-like protrusions that are commonly found on the palate of early tetrapods. Despite their widespread taxonomic occurrence and similar external morphology to marginal teeth, it has not been rigorously tested whether denticles are structurally homologous to true teeth with features such as a pulp cavity, dentine, and enamel, or if they are bony, tooth-like protrusions. Additionally, the denticles are known to occur not only on the palatal bones but also on a mosaic of small palatal plates that is thought to have covered the interpterygoid vacuities of temnospondyls through implantation in a soft tissue covering; however, these plates have never been examined beyond a simple description of their position and external morphology. Accordingly, we performed a histological analysis of these denticulate palatal plates in a dissorophoid temnospondyl in order to characterize their microanatomy and histology. The dentition on these palatal plates has been found to be homologous with true teeth on the basis of both external morphology and histological data through the identification of features such as enamel and a pulp cavity surrounded by dentine. In addition, patterns of tooth replacement and ankylosis support the hypothesis of structural homology between these tiny teeth on the palatal plates and the much larger marginal dentition. We also provide the first histological characterization of the palatal plates, including documentation of abundant Sharpey’s fibres that provide a direct line of evidence to support the hypothesis of soft tissue implantation. Finally, we conducted a survey of the literature to determine the taxonomic distribution of these plates within Temnospondyli, providing a broader context for the presence of palatal plates and illustrating the importance of maintaining consistency in nomenclature.

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“…En plus des acquis scientifiques livrés à la communauté internationale des chercheurs, ils persistent et se développent sous la responsabilité de quelques jeunes scientifiques ayant fait leur apprentissage dans l'équipe « mère ». Les développements actuels des techniques non destructives, de la modélisation 3D associée à la tomographie (Meunier et al, 2015 ;Sanchez et al, 2010) ou au synchrotron (Sanchez et al, 2012), ouvrent de nouvelles perspectives spectaculaires de dynamisation de l'anatomie et de la micro-anatomie des tissus squelettiques. Matériels vivants et fossiles, pouvant être investis avec ces méthodologies non destructives, restent deux supports de choix aptes à livrer de nouvelles données scientifiques précieuses dans le cadre d'approches structurales et fonctionnelles comparatives.…”

Section: En Conclusion Quel Avenir?unclassified

“…The current development of "non-destructive" techniques of 3D modelingn, linked with tomography (Sanchez et al, 2010;Meunier et al, 2015) or the "synchrotron light" (Sanchez et al, 2012), opens new prospects for dynamic studies of the anatomy and microanatomy of skeletal tissues. Extant or fossil material may be investigated through these non-destructive techniques and can still yield new data on the evolution, structure and function of vertebrates.…”

Section: As a Conclusion: What About The Future?mentioning

confidence: 99%