The product offers dichotomic and multivariable keys for the determination of larvae of about 140 Central European mayfly species. The program includes a family key as well as species keys of all 17 families represented in Central Europe. The larvae are documented in over 6.600 images. In the reference collection, species can be compared separately by family or, if the group “All Species” is selected, in any combination. Data on saprobic and length-zonal classification are included in the Ecology module and have been updated according to the latest version of the Fauna Aquatica Austriaca. There are no changes in content, species or image material in edition V. 3.0 compared to previous versions.