[2] The genus is known from a partial hind limb found in beds of the Upper Cretaceous Las Curtiembres Formation.

[1] It was named by Fernando Emilio Novas, Federico Lisandro Agnolín and Carlos Agustín Scanferla in 2010, and the type species is Intiornis inexpectatus.

With the body length of around 15 cm (5.9 in)[1] Intiornis was the size of a sparrow, thus representing the smallest enantiornithes known from South America.

Its closest relative was Soroavisaurus from the Lecho Formation (Maastrichtian age) of northwestern Argentina.

[2] The cladogram below is from Wang et al., 2022:[3] Cruralispennia Protopteryx Elsornis Flexomornis Iberomesornis Longirostravis Rapaxavis Sinornis Enantiornis Halimornis Concornis Neuquenornis Eoalulavis Liaoningornis Gobipteryx Hebeiornis Eocathayornis Qiliania Intiornis Soroavisaurus Avisaurus Gettyia Mirarce Feitianius Longusunguis Dunhuangia Musivavis Pengornis Yuanchuavis Eopengornis Parapengornis Grabauornis Parvavis Cratoavis Gretcheniao Huoshanornis Shengjingornis Zhouornis Bohaiornis Eoenantiornis Fortunguavis Mystiornis Shenqiornis Sulcavis Key to letters: b = Boluochia c = Cathayornis e = Enantiophoenix f = Houornis h = Longipteryx i = Parabohaiornis j = Pterygornis l = Vorona m = Yuanjiawaornis n = Yungavolucris Long toes of equal length and large curved claws suggest adaptability for perching.