很多专家认为侧颈龟目比起潜颈龟目要更加原始。
The Pleurodira are considered by many experts to be more primitive than the Cryptodira.
侧颈龟侧向收回脖颈；也就是说，他们把脖子侧弯以使头部隐藏在甲壳边缘下。
The pleurodirans withdraw their necks laterally; that is, they bend the neck sideways to tuck the head under the rim of the shell.
侧颈龟侧向收回脖颈；也就是说，他们把脖子侧弯以使头部隐藏在甲壳边缘下。
The pleurodirans withdraw their necks laterally; that is, they bend the neck sideways to tuck the head under the rim of the shell.
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