Figure 5. Proterochersis robusta NHMUK 38653 in Obscure by name: solving the enigma of Chelytherium obscurum, the first described Triassic turtle

Figure 5. Proterochersis robusta NHMUK 38653 (referred specimen of Chelytherium obscurum). A–P, parts of the shell in presumably external (A, C, E, G, I, K, M, O) and visceral (B, D, F, H, J, L, N, P) view (based on surface characteristics). Q, R, fragmentary costal in external (Q) and visceral (R) view. S–U, posterior left part of the plastron and ischium in ventromedial (S), ventral (T) and lateral (U) view. V–Z, posterior right part of the carapace in external (V), visceral (W, X), medial (Y) and medioventral (Z) view. Panels X and Z are three-dimensional models in orthographic view, with the Radiance Scaling shader enabled. In Z, the colours indicate broken attachments for ribs (green) and ilium (red).