Fig. 4 in A new record of a giant neoepiblemid rodent from Peruvian Amazonia and an overview of lower tooth dental homologies among chinchilloids

Fig. 4. Explanatory drawings of occlusal morphologies of lower molars at three ontogenetic stages in Phoberomys. A. Pentalophodont pattern in a juvenile specimen: MACN-Pv 2645, right m1 or 2 (occlusal surface) of Phoberomys burmeisteri; the laminae (A1), homology hypothesis 1 (A2), and homology hypothesis 2 (A3). B.Tetralophodont pattern in a juvenile specimen: MACN-Pv 2645, right m1 or 2 (outline pattern of the dental base) of P. burmeisteri. C. Trilophodont pattern in an adult specimen: MACN-Pv 3475, right m1 or 2 of P. burmeisteri. The direction of the arrow indicates the direction of development associated with an increase of the ontogenetic growth and dental wear. Note that the position of the fused structures is speculative. Based on Rasia and Candela 2018: fig. 4.