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Re: Segnosauria v Therizanosauroidea
The choice boils down to the issue of selecting a *ranking* for
the groups. Any family goup taxon that contains Therizinosaurus
must have a name based on that genus. For a taxon ranked above
the family grou level, any name can be used, so the more familiar
Segnosauria is preferable.
Choosing a rank is always the most subjective part of taxonomy.
So the answer to your question cannot be established definitively.
The peace of God be with you.