Fig. 2 in Growth dynamics and body size evolution of South American long-necked chelid turtles: A bone histology approach

Fig. 2. Stylopodial bones of chelid turtles sampled in this study, showing the position where the thin sections were obtained (gray bar) and the complete shaft section in each element. A–D. Hydromedusa tectifera Cope, 1869; Recent, La Plata, Buenos Aires province, Argentina. A. MLPR-6291, dorsal view of the left humerus (A1), cross section (A2). B. MLPR-6291, dorsal view of the left femur (B1), cross section (B2). C. MLPR-6411, dorsal view of the right humerus (C1), cross section (C2). D. MLPR-6411, dorsal view of the right femur (D1), cross section (D2). E–G. Yaminuechelys maior (Staesche, 1929); Cerro Hansen, Danian of Salamanca Formation, Chubut Province, Argentina. E. MPEFPV-599, dorsal view of the right humerus (E1), cross section (E2). F. MPEFPV-599, dorsal view of the left femur (F1), cross section (F2). G. MLP-14-9-23-1, dorsal view of the left humerus (G1), cross section (G2). Note that the expansion of the medullary region is higher in Y. maior than in H. tectifera (see discussion in the text).