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I my opinion, with the photography we can obtain as many information as with our own eyes, so all determinations based on keys dealing with lengths, bristles count, color, shape, etc. are possible from photographic images.

All depends on the skills of the photographer (photographic and taxonomic skills).

In the Internet era the pure text based keys could be replaced with photo/text based ones, inaugurating a new discipline: the PHOTOTAXONOMY.