Scottish Journal of Geology

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Scottish Journal of Geology New theropod dinosaur teeth from the Middle Jurassic of the Isle of Skye, Scotland by Chloe M. E. Young, Christophe Hendrickx, Thomas J. Challands, Davide Foffa, Dugald A. Ross, Ian B. Butler, and Stephen L. Brusatte Scottish Journal of Geology Volume 55(1):7-19 May 22, 2019 © 2019 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved

(a) Map of the Isle of Skye (Scotland), with a box denoting Brothers’ Point (Rubha nam Brathairean), where the two theropod teeth described here (NMS G.2018.17.1 and NMS G.2018.17.2) were discovered. (a) Map of the Isle of Skye (Scotland), with a box denoting Brothers’ Point (Rubha nam Brathairean), where the two theropod teeth described here (NMS G.2018.17.1 and NMS G.2018.17.2) were discovered. (b) Close-up map of Brothers’ Point, with major geological units indicated. Chloe M. E. Young et al. Scottish Journal of Geology 2019;55:7-19 © 2019 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved

Isolated neotheropod teeth from the Middle Jurassic of the Isle of Skye, Scotland. Isolated neotheropod teeth from the Middle Jurassic of the Isle of Skye, Scotland. (a–j) Crown of NMS G.2018.17.1 from the Lealt Shale Formation in (a), (e) lingual; (b) linguodistal; (f) labial; (g) mesial; (h) distal; (i) apical; and (j) basal views; with close up on (c), the apical portion of the mesial carina in mesial view; and (d) the distoapical denticles in linguodistal view. (k–r) Crown apex of NMS G.2018.17.2 from the Valtos Sandstone Formation in (k), (m) labial; (n) lingual; (o) distal; (p) mesial; (q) apical; and (r) basal views; with (l) close up on distoapical denticles in labial view. (a–d), (k–l) are photographs; (e–j), (m–r) are CT scan renderings. dca, distal carina; mca, mesial carina. All scale bars represent 1 cm; top scale bars for (a–j) (except c, d); bottom scale bar for (k–r) (except l). Chloe M. E. Young et al. Scottish Journal of Geology 2019;55:7-19 © 2019 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved

Classification of NMS G. 2018. 17. 1, NMS G. 2018. 17 Classification of NMS G.2018.17.1, NMS G.2018.17.2 and GLAHM 125390a coded as lateral crowns and analysed separately in the cladistic analysis performed with the datamatrix of 145 dental characters using TNT 1.1 and a constrained tree (CI = 0.21; RI = 0.46). Classification of NMS G.2018.17.1, NMS G.2018.17.2 and GLAHM 125390a coded as lateral crowns and analysed separately in the cladistic analysis performed with the datamatrix of 145 dental characters using TNT 1.1 and a constrained tree (CI = 0.21; RI = 0.46). For details of the constraint, please see the main text. For silhouette acknowledgements, see Supplementary material 1.5. Chloe M. E. Young et al. Scottish Journal of Geology 2019;55:7-19 © 2019 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved

Results of the discriminant function analysis (DFA) performed at the group-level on our personal datasets of 550 teeth belonging to 71 taxa gathered into 20 groupings along the first two canonical axes of maximum discrimination in the dataset (Eigenvalue of Axis 1 = 14.113, which accounts for 59.27% of the total variation; Eigenvalue of Axis 2 = 4.794, which accounts for 20% of the total variation). 59.27% of the theropod specimens were correctly classified in their respective groups, with NMS G.2018.17.1 and GLAHM 125390a being classified as non-abelisauroid Ceratosauria and Troodontidae, respectively. Results of the discriminant function analysis (DFA) performed at the group-level on our personal datasets of 550 teeth belonging to 71 taxa gathered into 20 groupings along the first two canonical axes of maximum discrimination in the dataset (Eigenvalue of Axis 1 = 14.113, which accounts for 59.27% of the total variation; Eigenvalue of Axis 2 = 4.794, which accounts for 20% of the total variation). 59.27% of the theropod specimens were correctly classified in their respective groups, with NMS G.2018.17.1 and GLAHM 125390a being classified as non-abelisauroid Ceratosauria and Troodontidae, respectively. The absence of mesial and distal denticles was considered as inapplicable in this analysis. For silhouette acknowledgements, see Supplementary material 1.5. Chloe M. E. Young et al. Scottish Journal of Geology 2019;55:7-19 © 2019 The Author(s). Published by The Geological Society of London for EGS and GSG. All rights reserved