Abstract
Arctosmittia biserovi gen. n., sp. n. (subfamily Orthocladiinae) is described from a single male. The specimen was collected in the Novaya Zemlya Archipelago (Yuzhnyi (Southern) Island, Pankov Peninsula). The new genus is closely related to Mesosmittia Brundin in the structure of the head, thorax, anal lobe, and squamae, and the presence of a false anal appendage in the male genitalia, but differs from it in a low value of the antenna index (AR < 1), the structure of the wing veins (FCu situated at the same level with cross-vein RM; veins R1 and R4+5 with macrotrichiae), presence of SCI on Ta1, and pseudospurs on Ta2 in the middle and hind legs, and in the structure of the genitalia (gonostylus with large additional lobe).
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