Matthew Bonnan提出蜥腳類恐龍的四肢骨頭,在成長的過程中會保持大致的形狀,長寬高以相等的程度增加。業餘科學家Jim Schmidt認為四肢以柱狀方式直立的動物,四肢骨頭會採取這種生長方式。大部分脊椎動物的四肢骨頭在成長過程中,長寬高的成長幅度不一致,造成形狀上的改變,以與增加的體重相符[16][17]。
隨者更完整的鯨龍化石的出土,約翰·菲力普斯(John Phillips)在1871年提出鯨龍是畸形龍的近親,也屬於恐龍[37]。自從1870年代開始,美國發現更多、更完整的蜥腳類化石(尤其是迷惑龍、圓頂龍),古生物學界才拼湊出這些大型爬行動物的外形。在1877年,John A. Ryder繪製圓頂龍的重建圖,這是第一個蜥腳類恐龍的重建圖[38]。同樣在1877年,理查德·萊德克根據在印度發現的零散脊椎,命名為泰坦巨龍(Titanosaurus),這是首次在南方大陸發現的蜥腳類恐龍[19]。
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