ArticleBiology letters2019
Retention of fish-like odontode overgrowth in Permian tetrapod dentition supports outside-in theory of tooth origins.
Article in Biology letters, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed, 15 citations in OpenAlex.
- A bristle-nosed Jurassic ray-finned fish (Actinopterygii) bears true dermal odontodes on its snout.Journal of anatomy · 2026Article
- Teeth outside the jaw: Evolution and development of the toothed head clasper in chimaeras.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Article
- A comprehensive phylogeny and revised taxonomy of Diadectomorpha with a discussion on the origin of tetrapod herbivory.Royal Society open science · 2024Article
- The conundrum of pharyngeal teeth origin: the role of germ layers, pouches, and gill slits.Biological reviews of the Cambridge Philosophical Society · 2022Review
- The developmental relationship between teeth and dermal odontodes in the most primitive bony fisheLife · 2020Article
- Multiple epithelia are required to develop teeth deep inside the pharynx.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
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Authors and funding
5 authors at 4 institutions in 4 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Teeth are often thought of as structures that line the margins of the mouth; however, tooth-like structures called odontodes are commonly found on the dermal bones of many Palaeozoic vertebrates including early jawless fishes. 'Odontode' is a generalized term for all tooth-like dentine structures that have homologous tissues and development. This definition includes true teeth and the odontodes of early 'fishes', which have been recently examined to gain new insights into the still unresolved origin of teeth. Two leading hypotheses are frequently referenced in this debate: the 'outside-in' hypothesis, which posits that dermal odontodes evolutionarily migrate into the oral cavity, and the 'inside-out' hypothesis, which posits that teeth originated in the oropharyngeal cavity and then moved outwards into the oral cavity. Here, we show that, unlike the well-known one-to-one replacement patterns of marginal dentition, the palatal dentition of the early Permian tetrapods, including the dissorophoid amphibian
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