Omeisaurus is the most common sauropod of late Jurassic of China, at least to judge by many fossil remains. Various species of this unusual plant eater had a long neck has been excavated over the past few decades, the smallest measuring only about 30 meters from head to tail, and the largest has a neck about the same size.
The closest relatives of dinosaurs seems to have become more long-necked sauropod Mamenchisaurus, which has a whopping 19 neck bones compared with 17 of Omeisaurus.
This dinosaur lived approximately during the Late Jurassic (165-160 million years ago). It has a length of about 50 feet and reach a weight between 5-10 tons. Omeisaurus a plant-eating herbivores.