Squalus balsvikensis

Siverson, 1993


Classification: Elasmobranchii Squaliformes Squalidae

Reference of the original description
Siversson, M. (1993)
Maastrichtian Squaloid Sharks from Southern Sweden. Palaeontology, 36(1), 1–19

Types
Squalus balsvikensis
Holotype: LO: 5065; Paratype: LO: 5066;


Description:


Citation: Squalus balsvikensis Siverson, 1993: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 07/2024

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Description
Original diagnose after Siverson (1993) p. 6-7 [2213]: Uvula very small and symmetrical in teeth from very young individuals; mesially twisted in teeth larger than about 1.1 mm. Axial foramina separated in teeth of very young individuals, otherwise fused into oblique infundibulum. Apron long and narrow with parallel edges in juveniles and mature males; relatively broad and short in large females. Basal face of root concave in profile. Mesial expansion of basal edge of root well developed but mostly not reaching apex of apron. Distal part of basal edge of root markedly bilobate.

Remarks
shark-references Species-ID=6709;
valid after Siverson (1993) p. 6 [2213]; Pollerspöck et al. (2021) p. 4 [30268];


References
Guinot, G. & Condamine, F.L. (2023)
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Pollerspöck, J. & Beaury, B. & Straube, N. & Feichtinger, I. (2021)
Oldest evidence of the genus Squalus in the north alpine realm with remarks on its evolution and distribution through time. Paleoichthys, 2, 1–9
Kriwet, J. & Klug, S. (2009)
Fossil record and origin of squaliform sharks (Chondrichthyes, Neoselachii). In Gallucci, V.F. & McFarlane, G.A. & Bargmann, G.G. (Eds). Biology and management of dogfish sharks. American Fisheries Society. Bethesda, Maryland: 19–38
Siversson, M. (1993)
Late Cretaceous and Danian neoselachians from southern Sweden. Lund Publications in Geology, 110, 1–28
Siversson, M. (1993)
Maastrichtian Squaloid Sharks from Southern Sweden. Palaeontology, 36(1), 1–19