also: うみぐもるい
noun
sea spiders
Refers to the class Pycnogonida, marine arthropods with long legs and a small body.
ウミグモ類は世界中の海に生息している。
Sea spiders inhabit oceans worldwide.
Compound of ウミグモ (sea spider) + 類 (class, kind). The exact derivation is uncertain, but the term is a straightforward taxonomic label.