埃希龙的化石在当时已知的泰坦巨龙类中算是保存较完整的,有大部分颅后骨骼。正模标本ISI R 335/1-65部位彼此相关、大致关节连接,是一副缺乏头骨、大部分包覆于石膏内的骨骼,发现在23×8米的范围内,由部分颈椎、背椎脊柱、荐骨、尾椎、肋骨、完整的骨盆、左肩胛骨、左鸟喙骨组成,桡骨、手部、后肢、脚骨皆遗失。[1]自首次发表后,相继有更完整的个体化石发现。[4][5]
埃希龙是中等体型的蜥脚类,2016年葛瑞格利·保罗(英语:Gregory S. Paul)身长18米及体重15公吨。[7]2020年莫里纳裴雷兹和拉腊曼迪给出身长11米、臀高3.9米、体重11.5吨的估计值。[8]埃希龙有着怪异的身体比例组合:长腿;前臂不成比例的加长;尾部结构典型;与体型相较而言,体腔非常的宽阔;一条短而粗壮的脖子,由形状收缩的颈椎所构成,最短的仅22公分。[8]
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