Body long, strong, with 3 body regions.
Prostomium small, rounded, without antennae. Eyes small and obscure; 2 long strong palps.
Peristomium with two small tentacles.
Anterior part of body consists of 11 segments with conical notopodia. Fourth notopodium with big, distally broadened, obliquely concave hooks (P. major-chaetae). Neuropodia absent.
Middle body region of two very elongate segments with bi- or trilobed notopodia and bilobed neuropodia.
Posterior body region of many short segments, with cylindrical notopodia and bilobed neuropodia.
Up to 300 mm for over 170 segments.
Cylindrical, straight, transparent.
Palps and posterior end violet; rest of body yellow. Parapodia with a pink spot at the base.
10-300 m deep.
Oslofjord, Mediterranean and West Africa.