Snakes and lizards both belong to the order Squamata, but to different suborders.
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usage
亚 means "sub-, one rank below" in biology: 目 (order) gives 亚目 (suborder), and likewise 纲 gives 亚纲 and 科 gives 亚科. Suborder names end in it: 猿猴亚目 (monkeys and apes), 蛇亚目 (snakes).
