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Pleijel, 1990

Body anteriorly and posteriorly tapered.
Median antenna of similar shape and size as paired antennae, which are situated on a distinct prostomial protuberance. Eyes absent. Proboscis distally with micropapillae in 6 longitudinal rows. No macropapillae. Terminal ring with 18-20 papillae.
Tentacular cirri of segment 1 reaching segments 6. Dorsal tentacular cirri of segments 2 and 3 reaching about segments 12-13. Ventral tentacular cirri distinctly or slightly flattened, reaching about segment 7. Dorsal and ventral cirri of median segments lanceolate; ventral cirri smaller and slightly asymmetrical (S. oliveri-detail). Pygidial cirri cylindrical, six to eight times as long as broad. Median pygidial papilla present. Each segment with one dorsal and two ventral bands of cilia.

Living relaxed specimen up to 23 for 100 segments.

Living animals transparent yellow. Prostomium with reddish colouration where the eyes are normally situated. Proboscis red. Preserved animals yellow to light brown.

Muddy sand or mixed bottoms with mud, sand, shells and stones. Known from about 25 to 500 m.

Koster area, Tromsø.

Sige oliveri