Sigmoscyllium acuspidatum

GUINOT, UNDERWOOD, CAPPETTA & WARD, 2013


Classification: Elasmobranchii Carcharhiniformes Scyliorhinidae

Reference of the original description
GUINOT, G. & UNDERWOOD, C.J. & CAPPETTA, H. & WARD, D.J. (2013)
Sharks (Elasmobranchii: Euselachii) from the Late Cretaceous of France and the UK. Journal of Systematic Palaeontology, 11 (6): 589–671

Types
Sigmoscyllium acuspidatum
Holotype: USTL: JUH1-44;


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 02/2021

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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.

Remarks
valid after Guinot et al. (2013) p. 657 [24889];

References
GUINOT, G. & UNDERWOOD, C.J. & CAPPETTA, H. & WARD, D.J. (2013)
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
GUINOT, G. (2013)
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
GUINOT, G. (2013)
Late Cretaceous elasmobranch palaeoecology in NW Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 388: 23–41
DOI: 10.1016/j.palaeo.2013.07.027