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Acrodont

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


The main lower jaw bone of a tuatara (Sphenodon punctatus), showing acrodont dentition

Acrodonty in the Animal Kingdom

Squamata: Within squamate reptiles, acrodont tooth implantation is best known in Acrodonta and some species of amphisbaenians, 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 dentition, though some snakes are occasionally described as having acrodont dentition.

Rhynchocephalia: Acrodont tooth implantation is common within Rhynchocephalia, including Sphenodon.

Amphibia: Acrodont tooth implantation also present in some frogs and the temnospondyl Microposaurus.

References

  1. "Know about Acro Root word and words based on this Root Acro". 29 August 2017.
  2. Plough, F. H. et al. (2002) Vertebrate Life, 6th Ed. Prentice Hall Inc., Upper Saddle River, NJ. ISBN 0-13-041248-1
  3. Jenkins, Kelsey M.; Shaw, Jack O. (2020-06-30). "Bite force data suggests relationship between acrodont tooth implantation and strong bite force". PeerJ. 8: e9468. doi:10.7717/peerj.9468. ISSN 2167-8359. PMC 7333653. PMID 32656000.
  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". Proceedings of the Royal Society B. 289(1969) (1969): 20212493. doi:10.1098/rspb.2021.2493. hdl:10141/622974. PMID 35193399.
  5. 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:10.1671/0272-4634(2006)26[138:TSHITC]2.0.CO;2. JSTOR 4524544. S2CID 86130973.
  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". Zoological Journal of the Linnean Society. 191 (2): 454–467. doi:10.1093/zoolinnean/zlaa063. hdl:10067/1748930151162165141.
  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)". Journal of Herpetology. 51 (3): 300–306. doi:10.1670/16-146. ISSN 0022-1511. S2CID 90519352.
  8. Edmund, A. G. (1969). "Dentition". Biology of the Reptilia. 1: 117–200. Retrieved 16 August 2017.
  9. "Objective Zoology".
  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)0242.0.co;2.

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