Fig. 2

3D reconstruction of the propodus-dactylus joint in Porcellio scaber. a A propodus-dactylus joint, reconstructed from serial optical sections, posterior view. The propodus is shown in green and the dactylus in red. The arthrodial membrane is not shown. b Propodus and dactylus shown separately. The thick edge of the process on the propodus fits in a groove on the dactylus. The propodus also forms a small condyle on the anterior side of the joint. Scale bar: 50 μm