Guillaume Houée, Nicolas Goudemand, Damien Germain, Jérémie Bardin
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Paleo-evo-devo implications of a revised conceptualization of enameloids and enamels.
Understanding the origin and evolution of the mineralized skeleton is crucial for unravelling vertebrate history. However, several limitations hamper our progress. The first obstacle is the lack of uniformity and clarity in the literature for the definition of the tissues of concern, especially of enameloid(s) and enamel(s), resulting in ambiguous terminology and inconsistencies among studies. Moreover, the identification criteria currently employed to characterize hypermineralized tissues in extinct taxa, such as the presence or absence of tubules for enameloids, may lead to unsupported conclusions. We suggest that comparative developmental studies may be key to unambiguous terminology, truly diagnostic identification criteria and developmentally informed evolutionary hypotheses. We exemplify this approach by: (i) introducing a new conceptual framework for enameloid(s) and enamel(s), with clear terminologies, definitions and interactions between concepts; (ii) suggesting more rigorous ways to identify tissues, based on the observation of defining or additional properties, as well as on the comparison of developmental scenarios when possible; (iii) constructing a clear phylogenetic framework to discuss their homologies and highlighting possible transitions between these tissues; and by (iv) proposing developmental models that explain both enamel and enameloid formation, and suggest possible transitions between them.
期刊介绍:
Biological Reviews is a scientific journal that covers a wide range of topics in the biological sciences. It publishes several review articles per issue, which are aimed at both non-specialist biologists and researchers in the field. The articles are scholarly and include extensive bibliographies. Authors are instructed to be aware of the diverse readership and write their articles accordingly.
The reviews in Biological Reviews serve as comprehensive introductions to specific fields, presenting the current state of the art and highlighting gaps in knowledge. Each article can be up to 20,000 words long and includes an abstract, a thorough introduction, and a statement of conclusions.
The journal focuses on publishing synthetic reviews, which are based on existing literature and address important biological questions. These reviews are interesting to a broad readership and are timely, often related to fast-moving fields or new discoveries. A key aspect of a synthetic review is that it goes beyond simply compiling information and instead analyzes the collected data to create a new theoretical or conceptual framework that can significantly impact the field.
Biological Reviews is abstracted and indexed in various databases, including Abstracts on Hygiene & Communicable Diseases, Academic Search, AgBiotech News & Information, AgBiotechNet, AGRICOLA Database, GeoRef, Global Health, SCOPUS, Weed Abstracts, and Reaction Citation Index, among others.