M. Sars, 1872
Description:
Body cylindrical, long and thin; with 19 chaetigers.
Prostomium oval to bean-shaped. Nuchal slits somewhat semicircular, with opening posteriorly.
Anterior 13 chaetigers are long, posterior segments short. The 8 first chaetigers with a glandular band anterior to parapodia.
Notopodial capillary chaetae with narrow, denticulate or smooth wings.
Anterior 4 neuropodia with 1-2 strong, blunt spines. Following neuropodia with hooks (L. cylindricauda-detail). Posterior 6-7 segments without chaetae.
On chaetigers 1-5 parapodia are set anteriorly on the segments; parapodia of chaetiger 6 behind the middle of the segment; on chaetigers 7-9 parapodia set anteriorly; on posterior segments parapodia behind the middle of the segment.
Pygidium cylindrical to conical.
Size:
Up to 130 mm for 19 chaetigers.
Tube:
Thick and solid structure, covered with fine sand and mud. Diameter outside 1.5 mm, inside 1 mm.
Colour:
Fixed, brownish pigment anteriorly on the prostomium, anterior parts of 1st and 2nd and posterior parts of the following segments up to segments 5 or 6.
Distribution:
Eastern North Atlantic between Iceland and Spain, western Norway to Skagerrak.