Extinct genus of birds
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Soroavisaurus is a genus of enantiornithean 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. A binominal name of this animal means "Southern sister Avisaur".
Description.
The specimens are in the collection of the Fundación-Instituto Miguel Lillo, Tucumán. They are cataloged as PVL-4690, a -long left tarsometatarsus, and PVL-4048, which includes another left tarsometatarsus, -long and associated with the whole hallux, or digit I, and four intermediate phalanges. PVL-4048 was previously described as "Avisaurus sp." (see "Avisaurus"). PVL-4048, the largest undoubted individual of "Soroavisaurus", indicates an animal with a length of , hip height of , and weight of . PVL-4033, a tibiotarsus, probably belongs to a "S. australis" is also known, book published in 2019 estimated its length of , hip height of , and weight of , making it the largest enantiornithean. However according to Walker and Dyke (2009) which considered PVL-4033 as "Martinavis" sp., its tibiotarsus length is , much shorter than that of "Lectavis" ( tibiotarsus) which the same book estimated a length of , hip height of , and weight of .
Phylogeny.
The cladogram below is from Wang "et al.", 2022:
Key to letters:
"b" = "Boluochia" ;br ;
"c" = "Cathayornis" ;br ;
"e" = "Enantiophoenix" ;br ;
"f" = "Houornis" ;br ;
"h" = "Longipteryx" ;br ;
"i" = "Parabohaiornis" ;br ;
"j" = "Pterygornis" ;br ;
"l" = "Vorona" ;br ;
"m" = "Yuanjiawaornis" ;br ;
"n" = "Yungavolucris"
Paleobiology.
Due to their large size and strong talons, "Soroavisaurus" could occupy the same ecological niche as extanct birds of prey, noticing prey from afar on the plains or in water. 
References.
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