Mainothrus (Ermilov, 2021)

Leg setation in Mainothrus View in CoL

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 View FIGURE 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.