Fig. 4
From: Variability and variation in Rhyncholestes raphanurus Osgood (Paucituberculata, Caenolestidae)
Lateral view of the posterior portion of the crania of Rhyncholestes raphanurus Osgood, showing variable development in the alisphenoid tympanic process (astp). White arrows indicate the pointy anterior process of the astp (FMNH 129827♀, FMNH 135036♂), which is not developed in FMNH 129833♀. Scale bar: 1 cm