Systematic studies on western palaearctic perlodini (Plecoptera: Perlodidae)

A review of the western Palaearctic perlodine genera, Besdolus Ricker, Diclyogenus Klapalek and Isogenus Newman indicates Besdolus must be placed in synonymy with Dictyogenus. Guadalgenus, a new monotypie genus from Spain, is erected for Isogenus franzi (Aubert). The new genus is distinguished from Dictyogenus and Isogenus by absence of lateral stylets and by a distinctive caudal epiproct sclerite in the male, by absence of a tufted lacinial knob in nymphs and by absence of a collar in the egg.