Fig. 8

a Example of a digitigrade stance based on the limbs of trilobites. After Størmer (1963). b A plantigrade stance based on the limbs of extant scorpions, the plantigrade segments of the limb termination in gray. After Størmer (1963). c Cross-section through a scorpion bothrium showing the sensory hair and socket in which it sits, three layers of the cuticle, and the pore canals. Also of note are the sensory dendritic bundle and lamellae. After Meßlinger (1987)