sea spider
Refers to marine arthropods of the class Pycnogonida, not true spiders. Used in biological and general contexts.
Sea spiders have long, slender legs.
A new species of sea spider was discovered in the deep sea.
Compound of 海 (umi, 'sea') and 蜘蛛 (kumo, 'spider'), literally 'sea spider'. The name reflects the superficial resemblance to true spiders.