LAUSR

Abstract Newly available specimens of Prototrichalus Molino-Olmedo et al., 2020 yield further diagnostic characters for the phylogenetic classification of this recently described genus. We show that Prototrichalus has tarsal formula 5-5-4, short trochanters, kidney-shaped eyes; the antennae are inserted in front of eyes and palpomeres substantially differ from all net-winged beetles. These characters identify tenebrionoid families as potential relatives of Prototrichalus. For example, extant and Eocene Ischalia Pascoe, 1860 (Anthicidae: Ischaliinae) resemble Prototrichalus in the structure of elytral costae and costal interspaces. As a result, we transfer Prototrichalus from Elateroidea: Lycidae to Tenebrionoidea incertae sedis. The earlier claim that Prototrichalus pushes the origin of Metriorrhynchini beyond earlier estimates is incorrect. The radiation of major net-winged beetle lineages was estimated ~123 million years ago and the deepest splits within Metriorrhynchini to 77–98 million years ago and these estimations were not considered in the discussion on Prototrichalus. We assume that the superficial similarity in the general appearance of Prototrichalus and net-winged beetles can be a result of mimicry in already very diverse Cretaceous beetles, but only further discoveries of additional species can provide robust evidence for the convergent evolution.