Anterior end of S. heros. Note the change from sparsely hirsute to densely hirsute antennal articles at the end of the 5th article. The first (proximal, basal) 5 antennomeres appear smooth, shiny, and glossy in the photo, in contrast to the remaining antennomeres, which are fuzzy or velveteen in appearance. This is because there is a change there in the degree of pilosity on the articles; at some point in most scolopendromorph centipedes there is a transition from sparsely hirsute to densely hirsute antennomeres, and the position of this transition is an important taxonomic character. The position isn't fixed in any species but has a range, like from the 4th-6th antennomeres.