灰龙(属名:Ngwevu,发音:'Ng-g'where-voo;学名取自科萨语ngwevu和intloko,意为“灰色颅骨”)是南非早侏罗世艾略特组的一属大椎龙科蜥脚形亚目恐龙。正模标本BP/1/4779由詹姆斯·科琴在1978发现,长期以来一直被视为一件颅骨横纵向扁平的不寻常的大椎龙标本,[1][2]直到2019年经过重新研究才被确认为一个新属。[3]该属的主要鉴定特征在于颅骨比大椎龙更为坚固。
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