Lineus
Encyclopedia
Lineus is a genus
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of nemertine worms
Nemertea
Nemertea is a phylum of invertebrate animals also known as "ribbon worms" or "proboscis worms". Alternative names for the phylum have included Nemertini, Nemertinea and Rhynchocoela. Although most are less than long, one specimen has been estimated at , which would make it the longest animal ever...

, including the bootlace worm
Lineus longissimus
The bootlace worm is one of the longest known animals, with specimens up to long and up to wide being reported. Its mucus is toxic.-Taxonomy:The bootlace worm is in the phylum Nemertea or ribbon worms...

, arguably the longest animal alive.
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