In other Polychaetes one or more pairs of similar outgrowths are glandular.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Similar collateral intestines are familiar in the Echinids and certain Polychaets (Capitellidae).
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10" by Various
Supplement to "A Plethora of Polychaetes" Aquarium Fish International magazine, January 2012, Vol 24, No.
As the sun goes down, the divers get situated around the bottom lighting, and often a sea swirl of planktonic life surrounds them (principally polychaete worms and crustaceans).
Select Polychaete — Bristleworm References.
Polychaete Worms For Your Reef Tank.
Many aquarists need an attitude adjustment when it comes to letting polychaetes other than feather duster worms be in their aquariums.