Cultus decisus

Cultus decisus (Walker, 1852) Notes This species is commonly referred to as the Great Lakes Springfly (Stark et al. 2012). Stark et al. (1988) proposed two disjunct subpsecies of C. decisus - northern C. d. decisus and southern C. d. isolatus (Banks, 1920). For this treatment, we have adopted the more inclusive species treatment. Cultus decisus sensu lato is known patchily from New Brunswick west to Michigan and south to Georgia (Stark et al. 1988, Kondratieff 2004, Myers and Kondratieff 2009, DeWalt et al. 2024). The life history and biology of the eastern Cultus remains poorly known (Stewart and Stark 2002). Larval descriptions of C. d. decisus, C. d. isolatus, and C. verticalis are currently available (Myers and Kondratieff 2009). Adult records in New York for C. decisus are available from mid-May through late July (Fig. 38) at elevations of 10-499 m asl (Fig. 39). This species was common in larger rivers in the Level IV Ecoregions Catskill High Peaks (58 y), Adirondack High Peaks (58 z), Eastern Adirondack Foothills (58 ac), Central Adirondacks (58 ad), Hudson Valley (59 i), Delaware-Neversink Highlands (60 b), Champlain Lowlands (83 b), and Mohawk Valley (83 f) (Fig. 40 b).