Leg ground plan is associated to the derived mode of locomotion of water striders. Leg allometry is established during embryogenesis in L. dissortis. (A) A late embryo showing T1 legs extending ventrally from the anterior to the posterior side, T2 legs folding dorsally reaching the head, and T3 legs extending laterally from side to side. (B) An adult L. dissortis individual showing the reversal in leg ground plan where T2 leg is longer than T3 leg, which in turn is longer than T1 leg. (C) This characteristic leg ground plan is associated to the mode of locomotion by rowing.