noun
ribbon worm; nemertean
Refers to any worm of the phylum Nemertea, often found in marine environments. The name comes from its long, ribbon-like shape.
See also: 紐形動物
海岸でヒモムシを見つけた。
I found a ribbon worm on the beach.
ヒモムシは細長い体をしている。
Ribbon worms have a long, slender body.
紐形動物 is the formal taxonomic term for the phylum Nemertea, while ヒモムシ is the common name for individual worms in this group.
From 紐 (ひも, 'string, cord') + 虫 (むし, 'worm, insect'), referring to the worm's long, ribbon-like shape.