Perlodidae

Earle, Jane I., 2009, New State Stonefly (Plecoptera) Records For Pennsylvania, With Additional Records And Information On Rare Species, Illiesia 5 (16), pp. 169-181 : 178

Perlodidae

The Pennsylvania Perlodidae fauna is represented by 27 species in 9 genera. The family is divided into 2 subfamilies, Isoperlinae which in Pennsylvania includes Isoperla and Clioperla , and Perlodinae , which includes the other genera. Isoperla has the most species of all the Pennsylvania stonefly genera, 17 described species and several undescribed species (Szczytko and Kondratieff unpublished). Perlodinae are most commonly collected in the forested mountainous regions of Pennsylvania. Although Perlodinae nymphs are often collected in the proper habitat, adults of most genera are rarely collected. Only new adult records are included for the following species.

Two species of Diploperla have been reported from Pennsylvania: D. duplicata (Banks) , which ranges from Pennsylvania south to Georgia, and D. robusta Stark and Gaufin , which was split from D. duplicata in 1974 and ranges from Connecticut south to Indiana and Kentucky. Recent collections suggest that D. duplicata is restricted to eastern Pennsylvania and D. robusta to western Pennsylvania; however, several records predating 1974 need to be examined and additional specimens collected. Both species of Diploperla are found in small to medium creeks. Diploperla nymphs are especially common in small creeks in the Allegheny National Forest in northwestern Pennsylvania.