Fig. 4

Tooth morphology of the extinct and living species of Galeorhinus, G. cuvieri MGGC 1976 (a) and G. galeus (b-d). a A composite image of UV photographs showing the upper and lower tooth arcades of MGGC 1976. b-d Detailed photographs of the dentition of G. galeus, showing b a right upper anterior tooth (tooth position: #3), c right upper anterolateral tooth (#5), and left upper anterolateral to lateral tooth files (d). Arrow indicates some of the characters differentially diagnostic to G. cuvieri (see Diagnosis). Ch. 1: tooth cusp upturned near tip (from anterior files distally); Ch. 2: distal and mesial shoulders of tooth at similar horizontal levels; Ch. 3: distal heel separated from cusp by a notch deeper than cusplets measured along distal cutting edge; Ch. 4, relatively wide basal furrow