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It seems that Nanna/Amaurosoma is a matter of opinion; I'm not quite sure which specialist to believe :D in this case. Sifner (2003) uses Amaurosoma and details why he think it is the valid name.

Sifner (2003), The family Scathophagidae (Diptera) of the Chech and Slovak Rebublics (with notes on selected Palaearctic taxa), Acta Mus. Nat. Pragae, Series B, Nat. Hist. 59(1-2):1-90 - an excellent paper, but suffering from unacceptably poor english (including some sections that simply make no sense at all:|)