I've been banging on about this for ages - it's frustrating. Strictly speaking the taxon Chiroptera isn't designated; it is the species that are designated. It just so happens that all species in the order Chiroptera are designated, which leads to the assumption that the taxon Chiroptera is also designated. With bats we also have the unusual situation of many records only being recorded to order level, thus many records which we know should have an implicit designation attached to them actually don't. So we have a dictionary that is technically correct, but from a pragmatic standpoint, it's wrong.
You can add your own designations to Chiroptera using the dictionary editor, but this is far from ideal as it requires prior knowledge on the part of the operator. I think this is one edge case where we break the rules and add appropriate designations to the order Chiroptera, even though this is officially incorrect. Does it occur with any other order/family/genus other than bats? Perhaps we could have a batch update to add and remove the designations as needed?
Charles Roper
Digital Development Manager | Field Studies Council
http://www.field-studies-council.org | https://twitter.com/charlesroper | https://twitter.com/fsc_digital