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Fig. 1. Fourth walking legs of arachnids, showing their basic anatomy. Whole legs are shown at approximately the same scale. (A) Heterometrus; left leg, anterior perspective, inset showing posterior perspective. (B) Eremopus; right leg, posterior perspective, inset showing elastic sclerite of patella—tibia joint. (C) Mastigoproctus; left leg, anterior perspective. (D) Aphonopelma; right leg, posterior perspective. (E) Leiobunum; right leg, posterior perspective, inset showing elastic sclerite of tibia—basitarsus joint. bf, basifemur; bt, basitarsus; es, elastic sclerite; ex, extensor muscle; fe, femur; pa, patella; tf, telofemur; ti, tibia; tr, trochanter; tt, telotarsus.