Toward a revised checklist of the Western Palearctic butterflies, hyperlinked to the original descriptions at species, genus and family level (Lepidoptera, Papilionoidea) Part II: Rationale and framework for the Hesperiidae.

Taxonomic and nomenclatural issues in the butterfly family Hesperiidae are reviewed with reference to ICZN rules, historical treatments, recent phylogenetic studies, and prevailing usage. Particular attention is given to subfamily and tribal classifications, where older names and synonymies have at times conflicted with prevailing usage, requiring careful evaluation under the Code.At the genus level, long-debated cases such as the priority of Muschampia versus Sloperia are reviewed, while at the species level, complex situations such as the Pyrgus alveus species group and the status of names like bellieri and foulquieri are considered in detail.For the subfamily Heteropterinae, the relationship between the older name Cyclopidinae and the later but widely used Heteropterinae illustrates the importance of balancing historical accuracy with nomenclatural stability.The review emphasizes the need for consistent application of ICZN provisions in order to promote stability and comparability across regional checklists. Nonetheless, several issues remain unresolved, and further progress will depend on broad genomic research, preferably based on whole genomes, together with extensive morphological studies that take into account the full variability of traits across populations.