Topic: Gordius (hairworm, Nematomorpha)
Gordius villoti was the recommended name for the Gordius recorded in Britain on the basis that Linnaeus' original Gordius aquaticus was not sufficiently well described. However, Andreas Schmidt-Rhaesa (2010 Zootaxa 2533: 1-35) has re-examined the argument for using the name Gordius aquaticus and now considers it valid and that villoti is probably a separate species.
In the last decade he has also described various new Gordius species from mainland Europe. I don't know that any of them have been recorded in Britain, but that might be just because he has not had any British specimens to examine. The characters he uses are only visible using electron microscopy. So I suggest all Gordius aquaticus/villoti records are reduced to Gordius sp. unless they have been identified using EM.