Body long and slender. Prostomium elongate, oval to conical.
Ventral pair of antennae somewhat longer than dorsal. Proboscis
with two mediodorsal and two lateral rows of papillae, distally
and ventrally only wrinkled ridges. Often the proboscis is
irregularly scattered with papillae, with two lateral papillae
at the anterior edge. Ventral pair of tentacular cirri longer
than dorsal. Dorsal cirri of anterior segments more or less
asymmetrical, oval, somewhat longer than broad or broader than
long, those of mid-body strongly asymmetrical, almost kidney-
shaped, up to 2 1/2 times as long as broad; posterior ones
asymmetrical, oval, often somewhat longer than broad (E.
spetsbergensis-parapodium). Terminal end of chaetal shaft
symmetrical with one large tooth and a few smaller ones on each
side. Blades long and slender. Ventral cirri longer than
parapodial lobes. Pygidial cirri finger-like. Up to 100 mm for
200 segments. Living animal dorsally with reddish banding and
dark dorsal cirri; ventrally green. In alcohol