Archegozetes Grandjean 1931

Leg setation in Archegozetes Archegozetes longisetosus, originally collected from Thailand (Aoki 1965), is a widespread tropical-subtropical species (Subías et al. 2012). Adult legs were illustrated by Beck (1967; his Figs 6–9), but no ontogenetic data were presented. Most setae were not labelled, but several errors can be corrected. (1) The three solenidial notations on tarsus I (Beck’s Fig. 6) are incorrect, based on our observations and on ontogenetic studies of tarsus I in the similar A. magnus by van der Hammen (1955b): using the standard ontogenetic sequencing, Beckʹs ω 1 should instead be ω 3; his ω 2 should be ω 1; and his ω 3 should be ω 2. 4 (2) On tibia I (his Fig. 6), the seta labelled vʺ is actually larval seta cʺ (vʺ does not form). Appendix 2 presents the ontogeny of setiform organs based on specimens from Costa Rica, complemented by observations from cultured Puerto Rican specimens (see Heetoff et al. 2013). Notable traits include: the presence of four larval setae (including cʺ) on tibia I, with a final complement of five; the absence of cʺ from larval tibia II, with a final complement of four; the absence of several fundamental tarsal setae, including the primilateral pair (pl) from tarsus I, primiventral setae (pv) from tarsi II and III, and fastigial seta ftʹ from tarsus III 5. Seta d is coupled with the respective solenidion on genua and tibiae I, II, but on tibiae III, IV and genu III they are noticeably separated. Both antelateral setae (a) are formed on tarsus IV. Regarding accessory setae, the iteral pair (it) are absent and the adult forms proximal setae on tarsi I–III and sometimes IV. The number of proximal accessory setae is variable and we did not study the statistics. But at least one lateral (l) pair forms on tarsi I and II, in addition to one or more ventral pairs (v); tarsus III seems to form only ventral setae; tarsus IV forms only vʹ or none. The tarsal variation in adults reported by Beck (1967) is certainly related to these setae.