FIG. 21 in Alcidedorbignya inopinata, a basal pantodont (Placentalia, Mammalia) from the early Palaeocene of Bolivia: anatomy, phylogeny and palaeobiology

FIG. 21. — Internal nasal structures and spaces of Alcidedorbignya inopinata (MHNC 8372) identified on six CT-slices in coronal view (A to F). Each cutting plane is indicated in the 3D-model of the right lateral wall of the nasal cavity (top left, septum removed). On the bottom right corner of each CT-slice is indicated the position of the slice within the sequence of 1812 images (resolution: on binned images, voxel size = 0.033mm). Abbreviations: C, canine; dnm, dorsal nasal meatus; etI, fossa for ethmoturbinal I; etII, fossa for ethmoturbinal II; fms?, probable area of attachment of the frontomaxillary septum; frI fossa for frontoturbinal I; frII, fossa for frontoturbinal II; fmxt?, possible fragments of the maxilloturbinal; M1, first upper molar; mxs, maxillary sinus; mxt, primary lamina of the maxilloturbinal; nlc, nasolacrimal canal; ns, nasal septum; nt, primary lamina of the nasoturbinal; P2, second upper premolar. Not to scale.