Agustinia () is a genus of sauropod dinosaur from the Early Cretaceous of South America. The genus contains a single species, Agustinia ligabuei, known from a single specimen that was recovered from the Lohan Cura Formation of Neuquén Province in Argentina. It lived about 116–108 million years ago, in the Aptian–Albian stages of the Early Cretaceous Period. Discovery and naming The holotype and only known specimen of Agustinia, MCF-PVPH-110, was discovered in 1997 by an expedition from the Museo Argentino de Ciencias Naturales in Buenos Aires, a few kilometers west of the city of Picún Leufú in the south of the Neuquén province. The rocks of the site belong stratigraphically to the upper section of the Lohan-Cura Formation . This excursion was part of a program run by the museum in 1996 and 1997 to discover new vertebrate fossils in the Lohan-Cura Formation. The generic name Agustinia honors then-student Agustin Martinelli, who discovered the skeleton and was part of the excavation team of the Museo Argentino de Ciencias Naturales. This dinosaur was originally named in a 1998 abstract written by Argentine paleontologist Jose Bonaparte. The original proposed generic name was "Augustia", which was already preoccupied by a beetle (see also Megapnosaurus and Protognathosaurus). Bonaparte changed the name to Agustinia in a full paper published in 1999. The specific name, ligabuei, honors Dr. Giancarlo Ligabue, a philanthropist who provided financial support to the expedition which recovered the remains. Description Only fragmentary remains of Agustinia are known. These include fragments of vertebrae from the back, hips, and tail regions of the spinal column. Parts of the lower hind limb were also recovered, consisting of a fibula, tibia, and five metatarsals. A femur (thigh bone) was found at the site, but was too fragmented to collect. Agustinia was known for its distinctive supposed armor plates, called osteoderms, initially interpreted as a series of wide, vertical spikes and plates down the center of its back, somewhat like the unrelated Stegosaurus. However, subsequent research has challenged the interpretation of these elements as osteoderms. Further study of the poorly preserved fossil material showed that these "plates" were in fact more likely to be fragments of ribs and hip bones. This reassessment was reaffirmed subsequently by histology of the purported osteoderms, which do not match the internal structure of other titanosaurian osteoderms. The fragmentary hip bone was tentatively identified as part of the ilium. A fibula (lower