Talk:Ephemera danica

What does this sentence mean?
The article says that "forelegs and the tails of the spinners are very much longer than in duns". What does this mean? The word "spinner" appears nowhere else in the article, is not hyperlinked, and to the best of my knowledge it does not have any dictionary meaning which would fit in context. Moreover, the supposed hyperlink to supporting material goes to a 404 page. Imerologul Valah (talk) 15:44, 6 August 2018 (UTC)