Figure 4 from: Hlebec D, Sivec I, Podnar M, Skejo J, Kučinić M (2021) Morphological and molecular characterisation of the Popijač's Yellow Sally, Isoperla popijaci sp. nov., a new stenoendemic stonefly species from Croatia (Plecoptera, Perlodidae). ZooKeys 1078: 85-106. https://doi.org/10.3897/zookeys.1078.66382

Figure 4 Extruded penis of Isoperla popijaci sp. nov. A male abdomen with extruded penis, ventral view B detail of penial armature on the lateral lobe, dorsal view C scales of the upper medial penial armature, dorsal view D pair of the scales spike-like on the ventral lobe, dorsal view.