Brontosaurus
"Brontosaurus" was a large, long-necked quadrupedal animal with a long, whip-like tail, and forelimbs that were slightly shorter than its hindlimbs. The largest species, "B. excelsus", weighed up to and measured up to long from head to tail. For comparison, the current largest land animal, the average male African bush elephant is 3.20 m (10.5 ft) tall at the shoulder and has a body mass of 6,000 kg (13,228 lb) or 6.6 short tons.
Kotasaurus
"Kotasaurus" is one of the most basal sauropods known. The general body plan was that of a typical sauropod, but in several basal (plesiomorphic) features it resembles prosauropods. Like all sauropods, "Kotasaurus" was an obligate quadruped, while prosauropods were primitively bipedal. The body length is estimated at roughly nine meters, with a weight of 2.5 tonnes, and therefore already comparable with that of later sauropods. The femur was straight and oval in cross section, which means that the limbs were already columnar. The teeth were spoon-shaped, like those of later sauropods. Basal features, on the other hand, include the relatively short and slightly twisted humerus, as well as the retention of a lesser trochanter on the femur. The neural spines of the vertebrae were simply built and their centra are massive, in contrast to those of the related "Barapasaurus", which show more hollowing, be it without pneumatisation, of the sides as a weight-saving measure.