adult leg Fig. 4-20, Fig. 4-21, Fig. 4-22, Fig. 4-23, Fig. 4-24, in Biology of Ticks ISBN:0-19-505910-7. TADS:0000002 TADS:0000002 Ticks have 4 pairs of walking legs as adults and nymphs (only 3 pair occur in larvae). Each leg consists of 6 segments, the coxa, trochanter, femur, patella, tibia and tarsus. The tarsus of each leg bears an apotele comprising the claws and the pulvillus (the latter is absent in most argasid tick nymphs and adults). A complex sensory organ, Haller's organ, is located on the dorsal surface of the tarsus of leg I. default_namespace organism subdivision