Thiesus concavus

GUINOT, CAPPETTA & ADNET, 2014


Classification: Elasmobranchii Carcharhiniformes Scyliorhinidae

Reference of the original description
GUINOT, G. & CAPPETTA, H. & ADNET, S. (2014)
A rare elasmobranch assemblage from the Valanginian (Lower Cretaceous) of southern France. Cretaceous Research, 48: 54–84

Types
Thiesus concavus
Holotype: USTL: VAL-198;


Description:


Citation: Thiesus concavus GUINOT, CAPPETTA & ADNET, 2014: 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. (2014) p. 77 [20107]: Minute-sized teeth not exceeding 1 mm in height with moderate gradient monognathic heterodonty. Tooth crown higher thanwide to as high as wide inposteriors. Lingually inclined elongate main cusp flanked by up to two pairs of little individualised lateral cusplets. Elongate labially directed mesial and distal heels. Labial crown edge strongly concave in labial viewand overhanging the root. Labial crownornament of scarce short vertical ridges on basal edge of the heels, more numerous and covering the labial crown face toward posterior files. Lingual crown ornament of slight irregular vertical ridges on main cusp and occasionally on cusplets. Hemiaulacorhize Y-shaped root with flared basal face. Strongly developed lingual protuberance with medio-central foramen. Elongate root branches with wide labial extremities. Numerous labial and margino-lingual foramina and one central foramen on the basal face.

Remarks
type species of Thiesus Guinot et al. (2014) p. 77 [20107] by original designation (Art. 68.2 ICZN);

valid after Guinot et al. (2014) p. 77 [20107];

References
GUINOT, G. & CAPPETTA, H. & ADNET, S. (2014)
A rare elasmobranch assemblage from the Valanginian (Lower Cretaceous) of southern France. Cretaceous Research, 48: 54–84
DOI: 10.1016/j.cretres.2013.11.014