Supersaurus vivianae (Vivian is Visian Jones, one of the couple who found the first carnosaur metatarsal that blew dad away because according to their description of the location where they found it, they were in the Jurassic, not Cretaceous where T Rex was located. That was the beginning of the whole Dry Mesa phenomenon.
Saurischia Sauropodomorpha Sauropoda Diplodocidae Diplodocinae
Morrison Formation, Colorado, US
Supersaurus (Jensen,1985) (=Ultrasauros Jensen vide Olshevsky, 1991) > S.vivianae (Jensen,1985) >> Ultrasaurus (Jensen,1985 preoccupied) Ultrasauros macintoshi (Jensen vide Olshevsky, 1991) >> Ultrasaurus macintoshi.(Jensen,1985)
Cervical vertebrae, scapulocoracoid, ischium, proximal causal vertebrae.