[1] The genus name Bonitasaura refers to the fossil quarry's name, "La Bonita", while the name of the type species, B. salgadoi, pays homage to Leonardo Salgado, a renowned Argentine paleontologist.

This ridge supported in life a sharp, beak-like keratin sheath that probably paired with a similar structure in the upper jaw.

The keratin sheath worked much like a guillotine to crop vegetation raked into the mouth by the peg-like front teeth.

These include a femoral osteoblastic tumour, an enthesophyte on metatarsal III, and abnormal tissue in a caudal prezygapophysis caused by an infection.

The results of their phylogenetic analyses are shown in the cladogram below:[9] Rinconsauria Bonitasaura Chucarosaurus Notocolossus Mendozasaurus Quetecsaurus Futalognkosaurus Puertasaurus Drusilasaura Argentinosaurus Patagotitan