9949 Brontosaurus
This minor planet was named after Brontosaurus, a gigantic quadruped sauropod dinosaurs, which walked on all four legs and lived in the Upper Jurassic. Adult individuals measured up to 20 meters and had a weight of up to 20 tons. Many Fossils have been found in the United States. Brontosaurus is one of the best-known dinosaurs. The official naming citation was published by the Minor Planet Center on 20 November 2002 ().
Brontotheriidae
Brontotheres, over time, evolved massive body sizes, although some small species, such as "Nanotitanops", did persist through the Eocene. Some genera, such as "Dolichorhinus", evolved highly elongated skulls. Later brontotheres were massive in size, up to in height with bizarre horn-like skull appendages. For instance the North American brontothere "Megacerops" evolved large sexually dimorphic paired horns above their noses. The sexually dimorphic horns suggest that brontotheres were highly gregarious (social) and males may have performed some sort of head-clashing behavior in competition for mates. However, unlike rhinos, the horns of brontotheres are composed of bone, the frontal bone and nasal bone, and were placed side-to-side rather than front-to-back.