The surangular or suprangular is a jaw bone found in most land vertebrates, except mammals. Usually in the back of the jaw, on the upper edge, it is connected to all other jaw bones: dentary, angular, splenial and articular. It is often a muscle attachment site. It has been noted in dinosaurs.
References
Dunham, Will (April 18, 2024). "Gigantic marine reptile's fossils found by British girl and father". Reuters. Retrieved 12 May 2025. https://www.reuters.com/science/gigantic-marine-reptiles-fossils-found-by-british-girl-father-2024-04-17/ ↩
Lomax, Dean R.; Salle, Paul de la; Perillo, Marcello; Reynolds, Justin; Reynolds, Ruby; Waldron, James F. (17 April 2024). "The last giants: New evidence for giant Late Triassic (Rhaetian) ichthyosaurs from the UK". PLOS ONE. 19 (4): e0300289. Bibcode:2024PLoSO..1900289L. doi:10.1371/journal.pone.0300289. ISSN 1932-6203. PMC 11023487. PMID 38630678. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11023487 ↩