The ridges on the lower jaw may have been used to feed on small invertebrates in loose sediment within the system of lakes and rivers that it resided in.

[1][2] Alexander Kellner, Jorge Calvo, Juan Porfiri, and Domenica dos Santos briefly described the specimen in an abstract at the 2011 Fourth Latin American Congress of Vertebrate Paleontology.

[1] The size of Argentinadraco is difficult to estimate, but the preserved segment of the lower jaw measures 259 mm (10.2 in) long.

This depression becomes a concave shelf at the back of the jaw, and it is unusually flanked by a pair of well-developed ridges inset from the actual outer margins.

[1][4][8] Although being toothless clearly places Argentinadraco in the Dsungaripteroidea sensu Kellner, more specifically within the Azhdarchoidea, its precise classification within this group is more elusive.

The proportions of at least the front portion of the lower jaw of Argentinadraco resembles those of the azhdarchid Zhejiangopterus, and the chaoyangopterids Chaoyangopterus and Shenzhoupterus.

[1] Nevertheless, Argentinadraco can be confidently excluded from the Pteranodontidae, Nyctosauridae, and Tapejarinae, the other groups of toothless dsungaripteroid pterosaurs.

Kellner and Calvo speculatively suggested that Argentinadraco used its peculiar jaw to slice through loose sediment in the rivers or lakes of its environment, potentially feeding on small invertebrates such as crustaceans.

Pterosaurs are rare in the Futalognko quarry, but remains (including an ulna) have previously been assigned to the Azhdarchidae.

[18][19] Dinosaurs include the theropods Megaraptor[20] and Unenlagia[21] (alongside dromaeosaurid and carcharodontosaurid teeth), the sauropod Futalognkosaurus,[22] and indeterminate iguanodontian ornithopods.

Finally, plant fossils are dominated by angiosperms, specifically dicotyledons, but leaves and fruiting bodies from gymnosperms are also known alongside conifers.