Leg setation in Mainothrus

Seniczak et al. (1998) presented the setal ontogeny of M. badius . Adult legs were illustrated by Weigmann (1997a), under the name Altrhypochthonius badius, but notations were not applied. Salient features include: the presence of four larval setae (including cʺ) on tibia I, with one added during development for a total of five; the absence of cʺ from larval tibia II, with a final complement of four; the presence of pair (pv) on tarsi I and IV but their absence from II and III; the presence of pair (a) on tarsi I–III, but only aʹ on IV. Regarding accessory setae, pair (it) are absent; pair (v A) form on all tarsi, with tarsus I additionally forming lʹ A. As in some Allonothrus species, on tarsus I of M. badius and M. paratransaltaicus Ermilov, 20216 seta ftʺ is strongly regressed (a minute spine) and near solenidion ω 1. Pair (pv) were indicated for tarsus II and III of M. paratransaltaicus (his Fig. 2), but ontogeny is unknown in this species, and we suspect these are instead accessory ventral setae (v), as in M. badius . Also, we suggest that—based on the illustrations—the tarsus IV setation of both M. paratransaltaicus and M. transaltaicus Bayartogtokh & Yondon, 2019 is identical to that of M. badius, i.e. with pairs (pv) and (v A), but with only one antelateral seta, aʹ.