Sigmoscyllium acuspidatum
Guinot, Underwood, Cappetta & Ward, 2013
Classification: Elasmobranchii Carcharhiniformes Scyliorhinidae
Reference of the original description
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
Description:
Citation: Sigmoscyllium acuspidatum Guinot, Underwood, Cappetta & Ward, 2013: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 11/2024
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Description
Original diagnose after Guinot et al. (2013) p. 657 [24889]: Teeth are small and are higher than wide. Main cusp sigmoid in profile view and inclined lingually, distally curved in some anterolateral teeth; main cusp with slightly swollen lower region, flanked by a pair of lateral heels oblique and labially oriented in anteriors, sub-horizontal and perpendicular to the main cusp in laterals. Labial face of crownwith straight toweakly sinuous longitudinal ridges nearly reaching apex of main cusp and base of crown; finer lingual ornament originating at mid-height of main cusp and reaching crown base. Heart-shaped root with flat to slightly concave basal face; root lobes flared labially with rounded labial extremities; strong mediolingual protuberance pierced by lingual foramen; concave mediolingual root edges in basal view. Root overhung by the mediolabial region of the crown in anterior teeth. Mediolabial foramen occasionally opens in a short and narrow groove on lower part of basal face. Several small mediolingual and mediolabial foramina.
Original diagnose after Guinot et al. (2013) p. 657 [24889]: Teeth are small and are higher than wide. Main cusp sigmoid in profile view and inclined lingually, distally curved in some anterolateral teeth; main cusp with slightly swollen lower region, flanked by a pair of lateral heels oblique and labially oriented in anteriors, sub-horizontal and perpendicular to the main cusp in laterals. Labial face of crownwith straight toweakly sinuous longitudinal ridges nearly reaching apex of main cusp and base of crown; finer lingual ornament originating at mid-height of main cusp and reaching crown base. Heart-shaped root with flat to slightly concave basal face; root lobes flared labially with rounded labial extremities; strong mediolingual protuberance pierced by lingual foramen; concave mediolingual root edges in basal view. Root overhung by the mediolabial region of the crown in anterior teeth. Mediolabial foramen occasionally opens in a short and narrow groove on lower part of basal face. Several small mediolingual and mediolabial foramina.
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
Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change. Scientific Reports, 12, Article 21906
DOI: 10.1038/s41598-022-26010-7
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
DOI: 10.1080/14772019.2013.767286
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
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Combining palaeontological and neontological data shows a delayed diversification burst of carcharhiniform sharks likely mediated by environmental change. Scientific Reports, 12, Article 21906
DOI: 10.1038/s41598-022-26010-7
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11(6), 589–671
DOI: 10.1080/14772019.2013.767286
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
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388, 23–41
DOI: 10.1016/j.palaeo.2013.07.027
