Paragnetina immarginata

Paragnetina immarginata (Say, 1823) Notes Paragnetina immarginata is commonly referred to as the Beautiful Stone (Stark et al. 2012). The distribution of this large and common species extends from Quebec and Maine south along the Appalachian Mountains to Tennessee and Georgia (Stark 2004, DeWalt et al. 2024). Little life history information exists for P. immarginata. Smith (1913) conducted a preliminary observational study of this species in New York over a three-month period in a tributary to Coy Glen (Tompkins County). Johnson (1981) reported dietary overlap between larvae of P. immarginata and A. capitata in Orwell Brook (Oswego County). Harper and Pilon (1970) found that this species exhibited an extended emergence period from early July to late August in Quebec. In New York, collections of adults range from mid-June through mid-September (Fig. 33) at elevations ranging from 50-658 m asl (Fig. 34) from larger streams and rivers across the state (Fig. 37 a).