We have pointed out that this is very confusing and that normal users cannot be expected to know this. In fact, this is rather ridiculous.
You typed in "Scae" so the list above should have
Scaeva pyrastri only once.
But it should also have
Scaeva unicolor (synonym for Scaeva pyrastri)
Scaeva mellina (synonym for Scaeva pyrastri)
and the links for "Musca" should not be there at all.
< so as Cassine has told us, these are synonyms: but in a most confusing and inexplicable format - the way I have shown it here is at least explicit and leaves out all the duplication).
This is a ridiculous solution for the programmers to a problem that they had, and the solved it by making this horrible format that confuses everyone -= even those of us that know the synonyms backwards.
Thank heavens that this species does not have five common names - under this new system, each one of those names would then be repeated five times - once each for the common names. A most unwieldy system dreamt up by someone who does not care about the poor users, and who obviously did not try it out for themselves. Also, if there are more than 20 matches it does not bother showing the others, so that this is only a small set of all the matches (this was fixed)
These have been logged as bugs on the Bug List.