Posted by John Bratton on 23-10-2008 15:45
#2
Of the three British species of Norellisoma, spinimanum is distinguished by the arista being short plumose rather than pubescent. It is hard to see on your photo, but the left arista, though out of focus, does look plumose.
The only synonym in the 1998 British checklist is nervosum, though this was a misidentification rather than a true synonym.
John Bratton