Isoperla dicala Frison, 1942

Myers, Luke William, Kondratieff, Boris C, Grubbs, Scott A, Pett, Lindsey A, DeWalt, R. Edward, Mihuc, Timothy B & Hart, Lily Veronica, 2025, Distributional and species richness patterns of the stoneflies (Insecta, Plecoptera) in New York State, Biodiversity Data Journal 13, pp. e 158952-e 158952 : e158952-

Isoperla dicala Frison, 1942

Notes

This species is commonly referred to as the Sable Stripetail ( Stark et al. 2012). Isoperla dicala is distributed extensively across eastern North America, reported from most Canadian Provinces and USA states both east and immediately west of Hudson Bay and the Mississippi River southward along the appalachians to South Carolina ( Szczytko and Kondratieff 2015, Verdone et al. 2023, DeWalt et al. 2024). Harper and Pilon (1970) documented emergence of I. dicala in late June from Ontario. In Virginia, adults were collected from late May to early July using a black light trap ( Kondratieff and Despins 1983). In New York, adults of I. dicala have been reported from early May to early August (Fig. 38 ) from elevations ranging from 53-512 m asl (Fig. 39 ). This species was collected frequently from larger streams and rivers in Level III Ecoregions Northeastern Highlands (58) and Eastern Great Lakes Lowlands (83), and likely has a broader distribution than current collections indicate (Fig. 41 c ).

Figures

Figure 38. Adult flight period for 28 Perlodidae species in New York State. Red fill indicates positive adult collections while gray shaded areas indicate adults are likely present but not reported.

Figure 39. Elevation box plot for 28 Perlodidae species in New York State. Boxes indicate interquartile range, horizontal line in box represents median elevation, and outlliers are depicted with large circles.

Figure 41 c. Isoperla dicala