Nemoura arctica Esben-Petersen 1910

Nemoura arctica Esben-Petersen, 1910 Notes This species is commonly referred to as the Arctic Forestfly (Stark et al. 2012). Grubbs et al. (2018) provided evidence with scanning electron microscopy that N. arctica is a circumpolar, northern Holarctic species. This species was previously recognized as N. trispinosa Claassen, 1923 in eastern North America. The North American range of this species is extensive, reported from Alaska, east across all Canadian provinces, and in the USA from Wyoming east across the Laurentian Great Lakes region to New England states (Grubbs et al. 2018, DeWalt et al. 2024). Harper (1973 a) found that larvae of N. arctica (as N. trispinosa) displayed a slow univoltine life cycle in a southern Ontario stream, with peak emergence occurring in mid-June. New York records are available from Level IV Ecoregions Eastern Adirondack Foothills (58 ac), Central Adirondacks (58 ad), Adirondack High Peaks (58 z), Finger Lakes Uplands and Gorges (60 d), and Champlain Lowlands (83 b) (Fig. 17 e). Adult collection dates range from early April to early August (Fig. 18). Reported elevations for this species in the state range from 119-469 m asl (Fig. 19).