Penis of Isoperla claudiae sp. n. A ventral view of the extruded penis B medial penial armature, scale bar 50 µm C medial penial armature, scale bar 50 µm D scales of the medial penial armature, scale bar 20 µm E scales found caudally the medial penial armature, scale bar 20 µm F medial penial armature of I. orobica, scale bar 200 µm. Photographs A–E by W. Lechthaler, Vienna.