Chiloscyllium frequens

GUINOT, UNDERWOOD, CAPPETTA & WARD, 2013


Classification: Elasmobranchii Orectolobiformes Hemiscylliidae

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
Chiloscyllium frequens
Holotype: NHMUK: P. 67021;


Description:


Citation: Chiloscyllium frequens GUINOT, UNDERWOOD, CAPPETTA & WARD, 2013: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 06/2021

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Description
Original diagnose after Guinot et al. (2013) p. 610 [24889]: Hemiscylliid with moderate degree of gradient monognathic heterodonty. Laterally compressed and high anterior teeth with no labial ornament; lateral and posterior teeth with better-developed root branches and few labial folds on the apron and marginal angles. Teeth up to 2.5 mm wide, anterior teeth higher than wide. Main cusp triangular, elongate and lingually directed. Up to two pairs of short cusplets, lateral cusplet very poorly developed or absent in anterior teeth. Ornament variable from completely smooth crowns to common slight vertical lingual folds on each side of the main cusp, few folds on the lateral margins of the labial face, or occasional short folds on the mediolabial region (posterior teeth). Cusps of lateral and posterior teeth inclined towards commissure. Basal edge of the apron generally convex but occasionally straight to slightly bifid and strongly overhanging the root. Root hemiaulacorhize and heart-shaped with wide mediocentral foramen. Presence of a mediolingual foramen and of several marginolingual foramina.

Remarks
valid after Guinot et al. (2013) p. 610 [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