(A) Avicularia sp., female from Beni province, Bolivia. Type II, basal section with a supporting stalk. Scale bar = 20 μm. (B) Caribena versicolor, juv. (car. 3.5). Type II, basal section. Scale bar = 2 μm. (C) Caribena versicolor, male. Type II, apical section. Scale bar = 10 μm. (D) Caribena versicolor, juv. (car. 2.5). Type II, midsection. Basal part on the left. Scale bar = 5 μm. (E) Caribena versicolor, juv. (car. 3.5). Type II, apical section. The basic morphology of urticating setae in juveniles is identical to mature specimens, but the barbs are less developed. Scale bar = 10 μm. Abbreviations: juv. = juvenile specimen; car. = length of carapace.