Isoperla sudetica (Kolenati, 1860)

Murányi, Dávid, 2011, Balkanian species of the genus Isoperla Banks, 1906 (Plecoptera: Perlodidae), Zootaxa 3049, pp. 1-46 : 4

sudetica group

Consiglio (1967) diagnosed this group based on the presence of scales of the medial and lateral armatures being spike-like instead of triangular, including both I. sudetica and I. silesica Illies, 1952a in the group. My examination suggests that other characters of I. sudetica agree with those of the rivulorum group. Additionally, I. silesica has a divided medial penial armature, a characteristic unique among western Palearctic Isoperla and one warranting placement of the species in the new silesica group. Thus, I. sudetica remains the only member of the group.