Figure 3 in Singing and dancing in the ghost crab Ocypode platytarsus (Crustacea, Decapoda, Ocypodidae)

Figure 3. Oscillograms and sonograms of the auditory/vibrational signaling of Ocypode platytarsus. Rap trains containing 1, 5 and 9 (A), 4, 3 and 4 (B) and 18 elements (C) have regular element separation and are produced by the major chela hitting the substrate. Part of a 54 element rap train (D) shows drumming during the last 4 s. As both chelae are involved, the element separation of drumming signals is shorter and more variable than that of rapping. The structural and temporal properties of 18 stridulations (E) (produced by moving the plectrum across the pars stridens of the major chela: Clayton 2001) clearly distinguish them from rapping events. Rapping and drumming events were recorded during this study while the stridulation was recorded in July 1999 (British Library Sound Archive reference number 131085). The sound produced by the dactyls during dancing is compared with that of rapping behaviour (F: left and right, respectively).