I've just had a look through the new checklist of Lepidoptera (groan!!!) and in many ways it is as strange and unsettling as I expected. The families have been reordered to some extent (for example, the Hawk-moths now come before the geometrids), which will take some getting used to, though I suppose that once field guides start using this ordering, the transition will be easier. My main concern is with the new numbering system, which consists of a two digit number, followed by a decimal point and three (rarely four) further digits. For instance Large Yellow Underwing will be 73.342. The first two digits represent the family, whereas the digits after the point represent the genus and species. I have no problem with in principle, but the result is a rather cumbersome number, which if like me, one uses the number when entering records on MapMate, or putting them in order, when compiling lists after trapping sessions, these new numbers will make that task that much more of a chore and possibly lead to a greater number of mistakes.
Of course, this is just the opinion of conservative old duffer and I will have to knuckle down to it like everyone else. Many will no doubt welcome this new checklist as a breath of fresh air and long overdue, the latter being probably true. For my part, I just wish they had stuck with a numbering system that didn't include those pesky decimal points.
On a positive note, at least there is an alphabetical list of vernacular names (another with scientific names too) with the new numbers alongside them, making it quick to look up the new numbers.