noun
eurypterid; sea scorpion
Refers to an extinct group of aquatic arthropods from the Paleozoic era; a technical term in paleontology.
ウミサソリは古生代に生息していた巨大な節足動物です。
Eurypterids were giant arthropods that lived during the Paleozoic era.
サソリ is a modern scorpion, while ウミサソリ is an extinct marine relative, not a true scorpion.
Compound of 海 (umi, 'sea') and サソリ (sasori, 'scorpion'), literally 'sea scorpion', a calque of the English name.