Q: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
The southern beeches Nothofagus previously thought closely related to beeches , are now treated as members of a separate family , Nothofagaceae .
A:
The southern beeches ( genus " Nothofagus " ) previously thought closely related to beeches , are now treated as members of a separate family , the Nothofagaceae ( which remains a member of the order Fagales ) .