"鲎"是个多义词，它可以指鲎（汉字释义）,鲎（鲎科鲎属动物）,鲎（中药）。
n. limulus
misc. horseshoe crab ; horsefoot ; limuloid
对于不同的鲎来说，其生理节奏的周期范围在22.2小时到25.5小时之间。
For different individual horseshoe crabs, the circadian period ranged from 22.2 to 25.5 hours.
人们发现，连续一年被关在黑暗的环境中的鲎仍然可以保持稳定的大脑活动节奏，这种稳定的节奏也使得它们的眼睛适应每日或明或暗的光线。
Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light.
不过鲎的习性尚未为人所知。
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