Balkanian species of the genus Isoperla Banks, 1906 (Plecoptera: Perlodidae) Author Murányi, Dávid text Zootaxa 2011 2011-10-05 3049 1 46 journal article 1175-5326 rivulorum group Consiglio (1967) diagnosed the group by the presence of an unfolded, short, wide medial penial armature that consists of triangular scales. As discussed before ridges may also be present, but are no longer considered a distinguishing characteristics of a group. My examination has determined that most of the species included in the group have lateral penial armatures. Additionally, baldness of the medial lobe and scarcity of uncoloured scales on the lateral lobes may also be diagnostic for the group. I have included the following in this species group: I. rivulorum , I. ambigua , I. andreinii ( Festa, 1938 ) , I. carpathica Kis, 1971 , I. citrina sp. n. , I. flava Kis, 1963b , I. goertzi , I. hyb- laea Consiglio, 1961 , I. ilvana Consiglio, 1958 , I. insularis , I. kir Fochetti & Vinçon, 1993 and I. oenotriae Consiglio, 1967 . Placement of I. moselyi ( Despax, 1936 ) in this group is questionable, considering the shape of the medial penial armature and its scales (G. Vinçon pers. com.).