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a) Left hemelytron of the backswimmer N. glauca. Four sections, defined by Wachmann [17], are shown. b) Scheme of the left hemelytron subdivided in 11 sections, according to Wachmann [17], and to variations in the hair density. c) Number of setae on the hemelytra of N. glauca and distribution of pins and clubs within the 11 sections shown in (b). d) Number of setae on the hemelytra of N. maculata and distribution of pins and clubs within the 11 sections shown in (b).
