Acroneuria abnormis

Acroneuria abnormis (Newman, 1838) Notes Acroneuria abnormis is commonly referred to as the Common Stone (Stark et al. 2012). This is amongst the most widely distributed stonefly species in North America. In Canada, A. abnormis has been reported from the island of Newfoundland west to Alberta. In the USA, this species has been recorded from 37 of the 48 conterminous states (Stark 2004, DeWalt et al. 2024). For additional context, the lack of records from New Hampshire, New Jersey, and Vermont are likely due to information deficiency and not true absence. Peckarsky (1979) documented this species from large to medium streams across a wide geographical area. Bottorff and Knight (1987) conducted a detailed ecological study A. abnormis, suggesting a two-year life cycle for larvae in Michigan streams. Kondratieff and Despins (1983) reported a late May to mid-July flight period in Virginia. Our records from New York indicate a flight period extending from mid-June to mid-August (Fig. 33) at elevations from 51-597 m asl (Fig. 34). Although this species has been collected frequently from large streams and rivers across the eastern half of the state (Fig. 35 a), further surveys in western New York should yield additional records.