What is "abavornis"

Abavornis ("Great-great-grandfather bird") is the name given to a genus of primitive birds from the Late Cretaceous, containing the single species A. bonaparti (named in honor of the Argentine paleontologist José Bonaparte). It was probably a member of the Enantiornithes, but as it is only known from a single broken coracoid ( TsNIGRI 56/11915), which, however, looks typically enantiornithine, that assignment is tentative. The fossil is from Late Cretaceous Bissekty Formation ( Coniacian, 89–86 MYA) in the Kyzylkum, Uzbekistan. Another partial coracoid ( PO 4605) is very similar and is referred to as Abavornis sp.; it might belong to A. bonaparti and if so show some features which are damaged in the holotype.