Isoperla autumnalis, Murányi, 2011

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

tripartita group

Consiglion (1967) diagnosed this group by the presence of a divided medial penial armature located on the ventral lobe of the penis. Divisions of the armature may be into an upper and lower portion and usually is at least partly divided into a left and a right half with the scales being dart-shaped. Lateral penial armatures are usually present. Uncoloured scales are scarce, but present on lateral lobes in a characteristic transverse, narrow stripe of hydra-like scales. Isoperla tripartita tripartita Illies, 1954 , I. tripartita recta Zwick, 1978 , I. autumnalis sp. n., I. illyrica Tabacaru, 1971 , I. obliqua Zwick, 1978 and I. pesici sp. n. are assigned to this group.