Panorpa setifera Webb, 1975
Diagnosis: This is one of four species of Panorpa in the debilis group that are unified by the presence of unusually long, thin aedeagal hamuli as part of the male genitalia. This group has forewings with entire apical and pterostigmal bands, interrupted basal band and no basal spots along the costal margin. Males of this group have a series of stout bristles on a small lobe at the apex of the basistyles. Panorpa setifera has ventral parameres that are relatively short (only reach base of dististyles), and have long, thick bristles at mid length..
Distribution – Geographical: This species is only known from Parfrey’s Glen along the Wisconsin River..
Distribution – Temporal: 21 July to 5 August (Webb, 1975).
Ecology: This species has been collected on jewel weed (Impatiens sp.) and stinging wood nettle (Laportea canadensis) along the small spring fed stream in Parfrey’s Glen (Webb, 1975). This glen is part of the Baraboo Range, which scientists believe were formed 1.6 billion years ago, making them one of the most ancient rock outcrops in North America.
Biology: Nothing is known of the immature stages or life history of this species.
Notes: There are currently considered to be four closely-related species in this species group (P. appalachia, P. bichai, P. debilis, and P setifera). The other species in this group may be considered to be distinctive isolated populations of P. debilis. Panorpa setifera is known from several populations along the Wisconsin River at the western edge of the range of P. debilis. It may be a long-isolated population that has developed some traits distinct from the main population, or it may have been isolated long enough to no longer have the potential for interbreeding with the main population. There is geological evidence that this area was unglaciated 15,000 years ago when Panorpa populations were forced to retreat in other parts of the upper Midwest. It differs from other populations of P. debilis in the much longer setae on the ventral parameres, and the much longer aedeagal hamuli of the male genitalia (Webb, 1975).
Webb, D.W. 1975. New Species of Panorpa (Mecoptera: Panorpidae). Entomological News, 85:171-173.