# Acrodont

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Tooth placement in bony fish

The main lower jaw bone of a [tuatara](/source/Tuatara) (*Sphenodon punctatus*), showing acrodont dentition

**Acrodonty** (from Greek *akros* 'highest'[1] + *odont-* 'tooth') is an anatomical placement of the teeth at the summit of the [alveolar ridge](/source/Alveolar_ridge) of the jaw, without sockets,[2] characteristic of [bony fish](/source/Osteichthyes). Functionally, acrodont tooth implantation may be related to greater bite force.[3] However, this result is not supported when size and phylogeny is taken into account.[4]

## Examples

### Squamata

Within [squamate](/source/Squamate) reptiles, acrodont tooth implantation is best known in [Acrodonta](/source/Acrodonta_(lizard)) and some species of [amphisbaenians](/source/Amphisbaenia), though some snakes are also referred to as being acrodont. Acrodonta is unique in that the name of the clade is based upon this trait. Most other squamate reptiles have [pleurodont](/source/Pleurodont) dentition, though some snakes are occasionally described as having acrodont dentition.[5][6]

### Rhynchocephalia

Acrodont tooth implantation is common within [Rhynchocephalia](/source/Rhynchocephalia), including *[Sphenodon](/source/Sphenodon)*.[7]

### Amphibia

Acrodont tooth implantation also present in some [frogs](/source/Frogs) and the [temnospondyl](/source/Temnospondyl) *[Microposaurus](/source/Microposaurus)*.[8][9][10]

## References

1. **[^](#cite_ref-1)** ["Know about Acro Root word and words based on this Root Acro"](https://wordpandit.com/acro-root-word). 29 August 2017.

1. **[^](#cite_ref-2)** Plough, F. H. et al. (2002) *Vertebrate Life*, 6th Ed. Prentice Hall Inc., Upper Saddle River, NJ. [ISBN](/source/ISBN_(identifier)) [0-13-041248-1](https://en.wikipedia.org/wiki/Special:BookSources/0-13-041248-1)

1. **[^](#cite_ref-3)** Jenkins, Kelsey M.; Shaw, Jack O. (2020-06-30). ["Bite force data suggests relationship between acrodont tooth implantation and strong bite force"](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7333653). *PeerJ*. **8** e9468. [doi](/source/Doi_(identifier)):[10.7717/peerj.9468](https://doi.org/10.7717%2Fpeerj.9468). [ISSN](/source/ISSN_(identifier)) [2167-8359](https://search.worldcat.org/issn/2167-8359). [PMC](/source/PMC_(identifier)) [7333653](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7333653). [PMID](/source/PMID_(identifier)) [32656000](https://pubmed.ncbi.nlm.nih.gov/32656000).

1. **[^](#cite_ref-4)** Isip, Justin E.; Jones, Marc E. H.; Cooper, Natalie (2022-02-23). ["Clade-wide variation in bite-force performance is determined primarily by size, not ecology"](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8864353). *Proceedings of the Royal Society B*. 289(1969) (1969) 20212493. [doi](/source/Doi_(identifier)):[10.1098/rspb.2021.2493](https://doi.org/10.1098%2Frspb.2021.2493). [hdl](/source/Hdl_(identifier)):[10141/622974](https://hdl.handle.net/10141%2F622974). [PMC](/source/PMC_(identifier)) [8864353](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8864353). [PMID](/source/PMID_(identifier)) [35193399](https://pubmed.ncbi.nlm.nih.gov/35193399).

1. **[^](#cite_ref-Budney_et_al._2006_5-0)** Budney, Lisa A.; Caldwell, Michael W.; Albino, Adriana (2006). "Tooth socket histology in the Cretaceous snake *Dinilysia*, with a review of amniote dental attachment tissues". *Journal of Vertebrate Paleontology*. **26** (1): 138–145. [doi](/source/Doi_(identifier)):[10.1671/0272-4634(2006)26\[138:TSHITC\]2.0.CO;2](https://doi.org/10.1671%2F0272-4634%282006%2926%5B138%3ATSHITC%5D2.0.CO%3B2). [JSTOR](/source/JSTOR_(identifier)) [4524544](https://www.jstor.org/stable/4524544). [S2CID](/source/S2CID_(identifier)) [86130973](https://api.semanticscholar.org/CorpusID:86130973).

1. **[^](#cite_ref-6)** Rajabizadeh, Mahdi; Van Wassenbergh, Sam; Mallet, Christophe; Rücklin, Martin; Herrel, Anthony (2020). ["Tooth-shape adaptations in aglyphous colubrid snakes inferred from three-dimensional geometric morphometrics and finite element analysis"](https://academic.oup.com/zoolinnean/article/doi/10.1093/zoolinnean/zlaa063/5865795). *Zoological Journal of the Linnean Society*. **191** (2): 454–467. [doi](/source/Doi_(identifier)):[10.1093/zoolinnean/zlaa063](https://doi.org/10.1093%2Fzoolinnean%2Fzlaa063). [hdl](/source/Hdl_(identifier)):[10067/1748930151162165141](https://hdl.handle.net/10067%2F1748930151162165141).

1. **[^](#cite_ref-7)** Jenkins, Kelsey M.; Jones, Marc E. H.; Zikmund, Tomas; Boyde, Alan; Daza, Juan D. (September 2017). ["A Review of Tooth Implantation Among Rhynchocephalians (Lepidosauria)"](http://www.bioone.org/doi/10.1670/16-146). *Journal of Herpetology*. **51** (3): 300–306. [doi](/source/Doi_(identifier)):[10.1670/16-146](https://doi.org/10.1670%2F16-146). [ISSN](/source/ISSN_(identifier)) [0022-1511](https://search.worldcat.org/issn/0022-1511). [S2CID](/source/S2CID_(identifier)) [90519352](https://api.semanticscholar.org/CorpusID:90519352).

1. **[^](#cite_ref-Edmund_1969_8-0)** Edmund, A. G. (1969). ["Dentition"](http://carlgans.org/bor-view/?borv=1&borpage=117). *Biology of the Reptilia*. **1**: 117–200. Retrieved 16 August 2017.

1. **[^](#cite_ref-9)** ["Objective Zoology"](https://books.google.com/books?id=cWJZnEQRUEoC&q=frog+acrodont&pg=SA4-PA77).

1. **[^](#cite_ref-10)** Damiani, Ross (2004). "Cranial anatomy and relationships of Microposaurus casei, a temnospondyl from the Middle Triassic of South Africa". Journal of Vertebrate Paleontology. 24 (3): 533–41. doi:10.1671/0272-4634(2004)024[0533:caarom]2.0.co;2.

## External links

- [Tooth Implantation](https://web.archive.org/web/20070701060131/http://www.palaeos.com/Vertebrates/Bones/Teeth/ToothImplantation.html)

- [Oral Cavity of Reptiles - Anatomy and Physiology](http://www.peteducation.com/article.cfm?cls=17&cat=1848&articleid=2812)

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Adapted from the Wikipedia article [Acrodont](https://en.wikipedia.org/wiki/Acrodont) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Acrodont?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.