Squatirhina draytoni
Guinot, Cappetta, Underwood & Ward, 2012
Classification: Elasmobranchii Rajiformes incert. fam.
Reference of the original description
Batoids (Elasmobranchii: Batomorphii) from the British and French Late Cretaceous. Journal of Systematic Palaeontology, 10(3), 445–474
Batoids (Elasmobranchii: Batomorphii) from the British and French Late Cretaceous. Journal of Systematic Palaeontology, 10(3), 445–474
Description:
Citation: Squatirhina draytoni Guinot, Cappetta, Underwood & Ward, 2012: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 09/2026
Description
Original diagnosis after Guinot, Cappetta, Underwood & Ward, 2012 [17161]: Teeth of small size (from 0.7 to 2 mm wide in adult individuals) with strong monognathic and sexual heterodonty. Lateral teeth anteroposteriorly expanded with well-developed uvula and labially protruding apron; labial face smooth; well-marked occlusal crest with occasional incipient cusp; vertical parallel folds on the labial and lingual marginal faces. Holaulacorhize root displaced lingually; marginolingual, central and paracentral foramina present. Anterolateral teeth anteroposteriorly compressed and strongly cuspidate with main cusp lingually directed, broad uvula; slight ornamentation of very short vertical ridges on lingual margins; root with strongly lingually developed lingual protuberance. Anterior teeth of breedingmales strongly cuspidate and mesiodistally compressed; wide uvula and apron; lateral lingual margins reduced with light ornamentation.
Original diagnosis after Guinot, Cappetta, Underwood & Ward, 2012 [17161]: Teeth of small size (from 0.7 to 2 mm wide in adult individuals) with strong monognathic and sexual heterodonty. Lateral teeth anteroposteriorly expanded with well-developed uvula and labially protruding apron; labial face smooth; well-marked occlusal crest with occasional incipient cusp; vertical parallel folds on the labial and lingual marginal faces. Holaulacorhize root displaced lingually; marginolingual, central and paracentral foramina present. Anterolateral teeth anteroposteriorly compressed and strongly cuspidate with main cusp lingually directed, broad uvula; slight ornamentation of very short vertical ridges on lingual margins; root with strongly lingually developed lingual protuberance. Anterior teeth of breedingmales strongly cuspidate and mesiodistally compressed; wide uvula and apron; lateral lingual margins reduced with light ornamentation.
References
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
Regional to global patterns in Late Cretaceous selachian (Chondrichthyes, Euselachii) diversity. Journal of Vertebrate Paleontology, 33(3), 521–531
DOI: 10.1080/02724634.2013.740116
Batoids (Elasmobranchii: Batomorphii) from the British and French Late Cretaceous. Journal of Systematic Palaeontology, 10(3), 445–474
DOI: 10.1080/14772019.2011.588255
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
Regional to global patterns in Late Cretaceous selachian (Chondrichthyes, Euselachii) diversity. Journal of Vertebrate Paleontology, 33(3), 521–531
DOI: 10.1080/02724634.2013.740116
Batoids (Elasmobranchii: Batomorphii) from the British and French Late Cretaceous. Journal of Systematic Palaeontology, 10(3), 445–474
DOI: 10.1080/14772019.2011.588255
