它们究竟是一种特殊的分支种群，还是其他各种蛇类的鼻祖？
Whether they are a peculiar sister group, or the ur-snake from which all others descend?
这项新发现可以推进有关后足蛇类在种族演化进程中的地位的不休争论——他们究竟是一种特殊的分支种群，还是其他各种蛇类在遗传意义上的鼻祖？
The new findings could advance the ongoing debate on the phylogenetic status of hind-limbed snakes-whether they are a peculiar sister group or the ur-snake from which all others descend.
蛇科响尾蛇亚科洞蛇属极毒蛇类，遍布美洲热带各种生境，从耕地到热带森林。
Extremely venomous pit viper (genus Bothrops), found in diverse tropical American habitats, from cultivated lands to forests.
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