Fossils have been found in Los Colorados Formation outcropping along the Sierra Morada River in the Ischigualasto-Villa Unión Basin in La Rioja, Argentina, and date back to the Norian age of the Late Triassic.

[4] The upper tooth row of Neoaetosauroides runs anteriorly to the tip of the elongated snout, evidence that is incompatible with the theory of a keratinous beak proposed for other aetosaurs.

[5] Biomechanical studies and muscle reconstructions of the skull of Neoaetosauroides have shown that it likely had a diet which diverged greatly from most other aetosaurs.

Quick jaw movement is sometimes utilized by herbivores for cropping plant material, but is more commonly associated with carnivory, as it allows small animals to be caught more easily.

It was therefore proposed that Neoaetosauroides may have had a generalized diet of soft-bodied colonial insects, supplemented by small vertebrates.