埃希龍的化石在當時已知的泰坦巨龍類中算是保存較完整的,有大部分顱後骨骼。正模標本ISI R 335/1-65部位彼此相關、大致關節連接,是一副缺乏頭骨、大部分包覆於石膏內的骨骼,發現在23×8公尺的範圍內,由部分頸椎、背椎脊柱、薦骨、尾椎、肋骨、完整的骨盆、左肩胛骨、左鳥喙骨組成,橈骨、手部、後肢、腳骨皆遺失。[1]自首次發表後,相繼有更完整的個體化石發現。[4][5]
埃希龍是中等體型的蜥腳類,2016年葛瑞格利·保羅(英语:Gregory S. Paul)身長18公尺及體重15公噸。[7]2020年莫里納裴雷茲和拉臘曼迪給出身長11公尺、臀高3.9公尺、體重11.5噸的估計值。[8]埃希龍有著怪異的身體比例組合:長腿;前臂不成比例的加長;尾部結構典型;與體型相較而言,體腔非常的寬闊;一條短而粗壯的脖子,由形狀收縮的頸椎所構成,最短的僅22公分。[8]
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