#tomopterid

Tomopterids are pelagic polycheates—segmented worms that live in the water column, never touching the seafloor.

They are relatively common in the deep mesopelagic, or twighlight zone. They are often only a cm or 2 long, but can also get to be quite large.

This one was photographed by Rob Sherlock in the R/V Western Flyer's wet lab and it spanned at least 10 inches, not including it's long tail!

Tomopterids have been observed spewing yellow bioluminescent mucous, presumably to deter predators. Yellow bioluminescence is rare in the deep and scientist don't yet know why this worm has adapted this ability.