蜥鳄（学名：Saurosuchus）意思为“蜥蜴鳄鱼”，是种已灭绝主龙类，属于劳氏鳄目，生存于三叠纪晚期的阿根廷。身长7米，是除了法索拉鳄以外的最大型劳氏鳄类。
刺背鳄蜥的进化速率比起包括洞熊、狮子、公牛和马在内的动物，都要快得多。
The tuatara rate is significantly faster than for animals including the cave bear, lion, ox and horse.
通常来说，如果温度升高，雌性后代的出生率就会高一些。但鳄蜥的情况正相反，在更温暖的环境下，雄性后代的出生率更高。
However, while a boost in temperature generally results in a nest full of more females than males, the opposite is true for tuatara whose offspring skew toward male in warmer climes.
他们发现，虽然刺背鳄蜥的大部分形态在长期的进化中并没有产生变化，但从DNA层面上看，它们比其他已经检测过的动物的进化速度都要快。
They found that, although tuatara have remained largely physically unchanged over very long periods of evolution, they are evolving - at a DNA level - faster than any other animal yet examined.
应用推荐