 For these reasons they argued that "Diplodocus" would have held its neck at a more elevated angle than previous studies have concluded.As with the related genus "Barosaurus", the very long neck of "Diplodocus" is the source of much controversy among scientists.A 1992 Columbia University study of diplodocid neck structure indicated that the longest necks would have required a 1.6-ton heart – a tenth of the animal's body weight.