Platyrhizodon gracilis

Guinot, Underwood, Cappetta & Ward, 2013


Classification: Elasmobranchii Carcharhiniformes incert. fam.

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
Platyrhizodon gracilis
Holotype: USTL: SRU-64;


Description:


Citation: Platyrhizodon gracilis Guinot, Underwood, Cappetta & Ward, 2013: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 01/2023

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Description
Original diagnose after Guinot et al. (2013) p. 662 [24889]: Small teeth showing low gradient monognathic heterodonty. Teeth as wide as high in all but anterior files; main cusp biconvex and slender without well-developed cutting edges, flanked by a pair of lateral heels. Labial ornament of short longitudinal ridges varying from weak and restricted to the marginal areas in anteriors to strong and covering the whole width of crown in laterals. Lateral teeth with distally inclined main cusp and rare incipient distal cusplet. Crown overhung by the strongly flared root at all points in basal view. Low root with flat basal face; concave lingual and labial faces in profile view. Convex lingual and straight to weakly concave labial faces in basal view. Numerous labial and marginolingual foramina; mediolingual and mediolabial foramina occasionally partly open in a notch or completely open in a median groove.

Remarks
type species of Platyrhizodon Guinot et al., 2016 p. 662 [24889] by original designation (Art. 68.2 ICZN);

valid after Guinot et al. (2013) p. 662 [24889];


References
Brée, B. & Condamine, F.L. & Guinot, G. (2022)
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
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