Amygdalodon

Amygdalodon (; "almond tooth" for its almond shaped teeth) was a genus of basal sauropod from the Middle Jurassic of Argentina. The type species is Amygdalodon patagonicus. Fossils of "Amygdalodon" have been found in the Toarcian Cerro Carnerero Formation of the Jurassic (about 180-172 million years ago). Very little is known about it, but it is one of the few Jurassic dinosaurs from South America found thus far.
Discovery.
The holotype (MLP 46-VIII-21-1) consists of some vertebrae, ribs, four complete and three partial teeth, and a partial pelvis and shoulder-blade, of which was discovered in 1936. The type species, "Amygdalodon patagonicus", was described by Cabrera in Argentina in 1947. Until 1936 sauropod fossils from Argentina were completely unknown then, prompted by Piatnitzky's brief mention of "bones of a saurian of no less than 5-7m long", Dr. Tomás Suero took a trip to Chubut to check out deposits overlying the Liassic of the Pampa de Agnia and discovered the remains of a Jurassic sauropod dinosaur around twice the size of Piatnitzky's estimation (in 1936).
Size.
"Amygdalodon" is estimated to have been long and tall. This quadrupedal dinosaur had an estimated weight of over .
Classification.
Rauhut (2003) placed "Amygdalodon" as Eusauropoda "incertae sedis" based on examination of the type material. Later, a cladistic analysis conducted by Carballido et al. (2010) recovered the genus as a non-eusauropod sauropod. Holwerda and Pol (2018) concurred, recovering "Amygdalodon" as sister to "Isanosaurus".