Isoperla marlynia

Isoperla marlynia (Needham & Claassen, 1925) Notes This species is currently referred to as the Midwestern Stripetail (Stark et al. 2012). Isoperla marlynia is a broadly distributed species reported from Nova Scotia west to Saskatchewan, southwest to Colorado, and sporadically south to South Carolina (Szczytko and Kondratieff 2015, DeWalt et al. 2024). Larvae are often found clinging to submerged wood in riffles of larger streams (Szczytko and Kondratieff 2015). Isoperla marlynia is presumably extirpated from Illinois and Indiana (DeWalt and Grubbs 2011, DeWalt et al. 2005). The adult filight period for I. marlynia in New York extends from late April to early June (Fig. 38). Populations have been found at elevations ranging from 136-522 m asl (Fig. 39) from Level IV Ecoregions Acid Sensitive Adirondacks (58 aa), Eastern Adirondack Foothills (58 ac), Central Adirondacks (58 ad), Tug Hill Transition (58 af), and Upper St. Lawrence Valley (83 e) (Fig. 42 d).