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Fig. 6. Distribution of teeth on the stridulatory file. (A) Plot of the inter-tooth distances over the length of the file for six specimens of P. pallicornis, each indicated with a different colour and symbol. Inter-tooth distances increase towards the basal end of the file (i.e. where the scraper contacts the last teeth during the closing stroke), but this increase is not smooth. (B) Plot of the cumulative number of teeth vs total distance along the file of five specimens (each shown in different colour). This indicates that the inter-tooth distance gradually increases basally, and that half of the total numbers of teeth are located in the anal one third of the file. (C) Inter-tooth distances of five Panacanthus spp. Trend lines are Lowess curve fits. Second degree polynomial regressions of inter-tooth distance against tooth number showed lower variability of tooth spacing in species using sustained pulses [P. cuspidatus, r²=0.95 (red outline) and P. pallicornis r²=0.87 (blue)]. Tooth spacing was more variable in species using transient pulses with broad band spectrum [P. gibbosus, r²=0.75 (black), P. intensus, r²=0.74 (green), P. varius, r²=0.02 (purple)].

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