This was followed by Choiniere and colleagues in 2010 , who described the first non-alvarezsaurid alvarezsauroid , Haplocheirus .
In 2009 , Livezey and Zusi used the name Alvarezsauroidea for the total group of all alvarezsaurs , restricting the name Alvarezsauridae to the clade defined by Alvarezsaurus + Mononykus .
This was followed by Choiniere and colleagues in 2010 , who described the first non-alvarezsaurid Alvarezsauroidea , Haplocheirus .
In 2009 , Livezey and Zusi used the name Alvarezsauroidea for the total group of all alvarezsaurs , restricting the name Alvarezsauridae to the clade defined by Alvarezsaurus + Mononykus .