sea spider
US /ˈsiː ˌspaɪ.dər/
UK /ˈsiː ˌspaɪ.dər/
1.
a marine arthropod of the class Pycnogonida, having a small body and eight long, slender legs, resembling a spider.
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The diver spotted a delicate sea spider clinging to the coral.
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Despite their name, sea spiders are not true spiders.