Figure 3.

Setae of Homalonychus and Sicarius have similar microstructures. SEM images of setae on the carapace of (a,c) Sicarius and (b,d) Homalonychus. Setae project from the cuticle at an angle in (a) Sicarius, have two parallel ridges extending up the posterior side and possess long, thin protruding hairlettes anteriorly and laterally (arrows in (a)). (c,d) Hairlettes taper and end in a globular form. The microstructures of these setae are the same in all Sicarius and Homalonychus individuals and species surveyed (see electronic supplementary material, table 1 for taxon sampling).