Squalicorax acutus

SIVERSSON, COOK, RYAN, WATKINS, TATARNIC, DOWNES & NEWBREY, 2019


Classification: Elasmobranchii Lamniformes Anacoracidae

Reference of the original description
SIVERSSON, M. & COOK, T.D. & RYAN, H.E. & WATKINS, D.K. & TATARNIC, N.J. & DOWNES, P.J. & NEWBREY, M.G. (2019)
Anacoracid sharks and calcareous nannofossil stratigraphy of the mid-Cretaceous "upper' Gearle Siltstone and Haycock Marl in the lower Murchison River area, Western Australia. Alcheringa, 43 (1): 85-113

Types
Squalicorax acutus
Holotype: WAM: 18.2.8; Paratype: WAM: 10.9.14; WAM: 18.1.8; WAM: 18.1.9; WAM: 18.1.10;


Description:


Citation: Squalicorax acutus SIVERSSON, COOK, RYAN, WATKINS, TATARNIC, DOWNES & NEWBREY, 2019: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 02/2021

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Description
Original diagnose after Siverson et al. (2019) p. 95 [27309]: Symphyseal teeth with sharp, continuous cutting edges and concave labial face of cusp. Anterior teeth with acute cusp, somewhat twisted in occlusal view. Cusp narrow and elongated in juvenile, lateral teeth. Serrations relatively well developed in anterior teeth but variably developed in lateral teeth. Labial surface of cusp moderately convex in most teeth. Crown’s labial side straight to slightly lingually curved in profile view. Basal edge of labial side of crown strongly scalloped in anterior teeth but less so in more posteriorly situated teeth. Crown overhangs labial face of root in all teeth. Lingual neck commonly scalloped in profile view. Root medially low in labial view and tightly curved in anteriorly situated teeth. Labial foramina relatively small.

Remarks
valid after Siversson et al. (2019) p. 95 [27309];


References
BERRELL, R.W. & BOISVERT, C. & TRINAJSTIC, K. & SIVERSSON, M. & ALVARADO-ORTEGA, J. & CAVIN, L. & SALISBURY, S.W. & KEMP, A. (2020)
A review of Australia’s Mesozoic fishes. Alcheringa, in press
DOI: 10.1080/03115518.2019.1701078
SIVERSSON, M. & COOK, T.D. & RYAN, H.E. & WATKINS, D.K. & TATARNIC, N.J. & DOWNES, P.J. & NEWBREY, M.G. (2019)
Anacoracid sharks and calcareous nannofossil stratigraphy of the mid-Cretaceous "upper' Gearle Siltstone and Haycock Marl in the lower Murchison River area, Western Australia. Alcheringa, 43 (1): 85-113
DOI: 10.1080/03115518.2018.1462401