What is "soroavisaurus"

Soroavisaurus is a genus of enantiornithine birds related to Avisaurus. It lived during the Late Cretaceous of Argentina. The only known species, S. australis, is known from fossils collected from the Lecho Formation ( Maastrichtian age) of Estancia El Brete, in the southern tip of the province of Salta, Argentina. The specimens are in the collection of the Fundación-Instituto Miguel Lillo, Tucumán. They are cataloged as PVL-4690, a 46.9 mm — long left tarsometatarsus, and PVL-4048, which includes another left tarsometatarsus, 51.5mm long and associated with the whole hallux, or digit I, and four intermediate phalanges. PVL-4048 was previously described as "Avisaurus sp." (see Avisaurus).