Unravelling the most diverse lance lacewing genus from the New World, Isostenosmylus Kruger (Neuroptera: Osmylidae)

The genus Isostenosmylus Kruger, 1913 (Neuroptera: Osmylidae) is the most species-rich genus of lance lacewings in the Neotropical region. Seven species are newly described here (Isostenosmylus angustipennis, sp. nov., Isostenosmylus apaapensis sp. nov., Isostenosmylus barbatus, sp. nov., Isostenosmylus inca, sp. nov., Isostenosmylus jaguar, sp. nov., Isostenosmylus penai, sp. nov., Isostenosmylus triangulatus, sp. nov.). A neotype of Oedosmylus morenoi Navas, 1928 is proposed, the male of Isostenosmylus irroratus Ardila-Camacho et al., 2016 is newly described, and identification keys to males and females of Isostenosmylus species are provided. A morphological phylogeny and biogeographical analysis of the genus are also presented. Isostenosmylus is recovered as a monophyletic genus and species are divided in two main clades (named here as 'bifurcatus' and 'pulverulentus' clades); the greatest diversity of this genus is located in the Andean mountain range, where new studies should be focused on.