N any large extinct scorpion-like aquatic arthropod of the group Eurypterida, of Palaeozoic times, thought to be related to the horseshoe crabs 板足鲎目动物
Like many arthropods, the scorpion and eurypterid had a waxy coating on their exoskeletons to keep them from drying out.
Cody说，就像很多节肢动物，蝎子和广翅鲎在他们的外骨骼的外侧有一个蜡质的外层用于防止他们过于干燥而死亡。
Eurypterid: any of various large segmented aquatic arthropods of the order eurypterida that existed from the ordovician period to the Permian period.
(古生)板足鲎目的：一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期。
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