Fig. 1. (A) Sketch of an ovipositing locust. Extension of the abdomen is achieved by unfolding the intersegmental membranes between the fourth and seventh segments (oviposition segments, shaded). (B) The internal anatomy of the fourth, fifth and sixth abdominal segment (AS4–AS6; the internal layer of muscle fibres is at the top of the figure). Longitudinal muscles are referred to as ventral (sternal) or dorsal (tergal) longitudinal muscles. During oviposition, these muscles must follow and tolerate the extension. A and B were adapted from Rose et al. (Rose et al., 2000). a–d and a,b designate part of the muscles M212 and M213, respectively; exp., expiratory; insp., inspiratory.
