Protoxynotus mayrmelnhofi

Feichtinger, Guinot, Straube, Harzhauser, Auer, Ćorić, Kranner, Schellhorn, Ladwig, Thies & Pollerspöck, 2022


Classification: Elasmobranchii Squaliformes Somniosidae

Reference of the original description
Feichtinger, I. & Guinot, G. & Straube, N. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Schellhorn, S. & Ladwig, J. & Thies, D. & Pollerspöck, J. (2022)
Revision of the Cretaceous shark Protoxynotus (Chondrichthyes, Squaliformes) and early evolution of somniosid sharks. Cretaceous Research, 140, Article 105331

Types
Protoxynotus mayrmelnhofi
Holotype: NHMW: 2021/0116/0001; Paratype: NHMW: 2021/0116/0001; NHMW: 2021/0116/0001;


Description:


Citation: Protoxynotus mayrmelnhofi Feichtinger, Guinot, Straube, Harzhauser, Auer, Ćorić, Kranner, Schellhorn, Ladwig, Thies & Pollerspöck, 2022: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 01/2023

Please send your images of "Protoxynotus mayrmelnhofi" to info@shark-references.com

Protoxynotus mayrmelnhofi sp. nov. L-M Holotype (NHMW/2021/0116/0001), lower jaw: L lingual, M labial; N-O Paratype (NHMW/2021/0116/0002), lower jaw: N lingual, O labial; P-Q Paratype (NHMW/2021/0116/0003), lower jaw: P lingual, Q labial, Upper Maastrichtian, Waidach near Nussdorf, Austria. Scale bars equal 500 μm

Description
Original diagnose after Feichtinger et al. (2022) [30999]: Labio-lingually compressed, asymmetrical but delicate teeth not exceeding a height of 1.8 mm and a width of 0.5 mm. Teardrop-shaped and smooth cusp flanked by a well-rounded distal heel. Broad extension (sinuosity) of enameloid towards the base on lingual face with basally adjacent pronounced bulge, exhibiting one medio-lingual foramen and a central foramen. Nutritive groove on basal face running from the labial root edge to the central foramen. A pair of margino-lingual foramina is present on the edges of the lingual bulge, slightly higher than the medio-lingual foramen. Labial crown possesses a long apron, bordered laterally by several margino-labial foramina.

Remarks
valid after Feichtinger et al. (2022) [30999];


References
Feichtinger, I. & Pollerspöck, J. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Guinot, G. (2023)
Shifts in composition of northern Tethyan elasmobranch assemblages during the last millennia of the Cretaceous. Cretaceous Research, 142, Article 105414
DOI: 10.1016/j.cretres.2022.105414
Feichtinger, I. & Guinot, G. & Straube, N. & Harzhauser, M. & Auer, G. & Ćorić, S. & Kranner, M. & Schellhorn, S. & Ladwig, J. & Thies, D. & Pollerspöck, J. (2022)
Revision of the Cretaceous shark Protoxynotus (Chondrichthyes, Squaliformes) and early evolution of somniosid sharks. Cretaceous Research, 140, Article 105331
DOI: 10.1016/j.cretres.2022.105331