Current 24+ Diplodocus Size. New horizons, there are six. Marsh coined its name in 1878. 1877 (). 1877 () . Diplodocus Size - Sculpture Dinosaur Sauropoda Diplodocus Live Size Animals Wildlife Stock Image 628044392 Wanting to know all about the diplodocus? It, along with sauropods such as. Early artists' renditions of diplodocus' posture depict a straddling gait, with the legs put out to the side and belly dragging along the ground.