Agnetina capitata

Agnetina capitata (Pictet, 1841) Notes Agnetina capitata is commonly known as the Northern Stone (Stark et al. 2012). The range of this widespread and common species extends in Canada from Newfoundland-Labrador and the Atlantic Maritime Provinces west to Manitoba and in the USA from Maine west to Minnesota and Iowa, and further south from Pennsylvania and Virginia west to Oklahoma (Stark 2004, DeWalt et al. 2024). Moreira and Peckarsky (1994) documented complex variation of a delayed egg hatch, resulting in cohort splitting into two and three years for a population in Tompkins County, New York. Harper (1973 b) reported the emergence of this species from early June to late July in southern Ontario. In New York, adults of A. capitata have been collected between mid-May to mid-August (Fig. 33). This species was common in streams and rivers at elevations ranging from 25-821 m asl (Fig. 34) and is widely distributed and common across the state (Fig. 35 e).