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Yeah, you have to be careful to correct Andersen's key with regard to Siphona urbana/geniculata/cristata. While Andersen's treatment was strictly correct, Tschorsnig, Herting & O'Hara successfully petitioned for the name to be retained due to common usage. S. geniculata was conserved by the replacement of the lectotype with a neotype.

See ICZN case 3084 & opinion 1975 :)

Andersen's urbana = current geniculata
Andersen's geniculata = current cristata