Heinrich Mallison於2011年爭論到後凹尾龍可能可以將前段與後段尾部彎曲成一定角度,形成中間的角度帶,從而前段部分直立時可以比其他蜥腳類更挺直。[36]2005年,Wilson假設直立不僅後凹尾龍也可通用於其他薩爾塔龍科物種,這些物種的共通特徵例如縮短的尾部可能就是為了直立的演化適應。[31]
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