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(Reimers, 1933)

Description:
Body elongated, oval, strongly tapering at both ends.
Prostomium indistinct, with small papillae and four filamentous antennae.
The first segment is papillated, with a pair of filamentous tentacular cirri, two eyes and a papilla-like median antenna.
Following segments dorsally with a transverse row of 2-9 big tubercles and two rows of smaller papillae.
Parapodia conical, with three terminal tubercles and up to 8 chaetae with smooth falciger blades and a finger-like ventral cirrus (S. baltica-detail).
Pygidium with 2 round cirri.

Size:
Up to 2.2 mm long for 16 segments.

Colour:
Living animal yellow to brown.

Habitat:
On sand and mud, 6-20 m deep, also in brackish water. Burrows in sediment, not swimming freely, like may other species of the family.

Distribution:
North Sea, Öresund, Baltic Sea.

Sphaerodoropsis baltica