A fact from Hapalopilus rutilans appeared on Wikipedia's Main Page in the Did you know column on 27 October 2012 (check views). The text of the entry was as follows:
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Why is the name Hapalopilus rutilans still used by some, and by who?
After doing some digging, I think I've found a good source to help answer the first part of your question, and have given some examples in a footnote for the second part. Sasata (talk) 05:52, 10 November 2015 (UTC)Reply
What are its closest relatives?
The only useful phylogenetic work including this species and some congeners that I found was published in 2001, and I don't think its conclusions were sufficiently relevant for this article. Sasata (talk) 05:52, 10 November 2015 (UTC)Reply
Is it native throughout its distribution? How did it disperse this far? Or is it just very old?
These are good questions, to which I cannot find answers. I would guess it has a native circumboreal distribution with perhaps introductions to Australia and Oceania, but cannot find this written down anywhere. Sasata (talk) 05:52, 10 November 2015 (UTC)Reply
"One German family who consumed" When? Not too important, but couldn't help wondering, and you do give a date for another case.