Fig. 4From: Cranial and mandibular anatomy of Plastomenus thomasii and a new time-tree of trionychid evolutionInterpretative line drawings of the cranium of Plastomenus thomasii (AMNH FR 6015). A dorsal view. B left lateral view. C ventral view. Drawings are based on renderings in Fig. 3. Labels indicate incompletely preserved features and our interpretation thereofBack to article page