Triunfosaurus

Triunfosaurus (meaning "Triunfo Basin reptile") is a genus of somphospondylan sauropod dinosaur from the Early Cretaceous of Brazil. It contains a single species, T. leonardii, described by Carvalho et al. in 2017. As a genus, Triunfosaurus can be distinguished from all other titanosaurs by the unique proportions of its ischium. It was initially described as a basal titanosaur, making it the earliest basal titanosaur known; however, subsequent research questioned the identification of the taxon as a titanosaur, instead reassigning it to the Somphospondyli.

==Description== Triunfosaurus can be distinguished from other titanosaurs by two autapomorphies, or unique traits that distinguish it from other titanosaurs. Namely, the part of the ischium touching the pubis is half the height of the entire ischium, and the shaft of the ischium makes an angle of less than 70° with the acetabular portion, which contributes to the hip socket. It also presents a unique combination of vertebral characters not seen otherwise among titanosaurs, which are described below.