Taxonomic work has a profound impact in many fields including various aspects of entomological researches in general and in plant protection in particular. At the core of taxonomic information are taxonomic catalogues and checklists that serve as a guide to the diversity of life. They summarize the work in systematics and taxonomy that enable assessment of faunal diversity and classification and provide information on historical taxonomic actions. Catalogues and taxonomic data also provide a universal language indispensable for unambiguous conveyance of biological information. Such information is increasingly important in developing an understanding of our natural environment, and will make significant contribution to decisions on changes to that environment.