Some housecleaning examples where a source isn’t really citable:
https://www.inaturalist.org/taxon_changes/32387 (merging duplicates)
https://www.inaturalist.org/taxon_changes/30102 (swapping duplicates)
https://www.inaturalist.org/taxon_changes/23462 (changes that have more to do with curatorial jurisprudence than an external authoritative opinion; in this case, what “internodes” we should support)