Fig. 1

Camel spiders and their malleoli. a Galeodes arabs, dorsal view. b Anteroventral view of malleoli on the ventral surface of the fourth walking legs. Five malleoli are present on each leg, located on the coxa (or basis; 2 malleoli), trochanter (2 malleoli) and femur (1 malleolus). Abbreviations: co coxa, fe femur, me metatarsus, pa patella, ta tarsus, ti tibia, tr trochanter. Walking legs 1–4 are labelled 1st to 4th. Note that in a, the first walking legs are partly obscured by pedipalps