Lineus longissimus

Bootlace worm
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Nemertea
Class: Pilidiophora
Order: Heteronemertea
Family: Lineidae
Genus: Lineus
Species:
L. longissimus
Binomial name
Lineus longissimus
(Gunnerus, 1770)

The bootlace worm (Lineus longissimus) is a species of ribbon worm and one of the longest known animals, with specimens up to 55 m (180 ft) long being reported. Its mucus is highly toxic.