Sosane sulcata can be up to 20 mm long. It can be found along the entire Norwegian coast at depths between 12 and 500 meters.
Koster, Bohuslän, Sweden, 20 m.
Measurements: Up to 20 mm long
Number of thoracic chaetigers, excluding paleae: 15
Number of thoracic uncinigers: 12
Number of abdominal uncinigers: 12
Prostomium: Trilobed; numerous eyespots
Mouth tentacles: Smooth
Branchiae: Four pairs of branchia in two groups separated by distance equal to about one branchial base diameter; three branchiae in each group in transverse row, fourth branchia located behind the inner branchia of the row
Paleae: Small with filiform tips; 15–20 chaetae on each side
Special features: 13th pair of thoracic notopodia elevated and transformed into transverse narrow vertical wings, nearly meeting at mid-dorsum
Pygidium: With two short lateral cirri
Tube: Thin layer of organic secretion incrusted with mud
Entire Norwegian coast; 12–500 m (Holthe 1986a).
The elevated 13th pair of thoracic notopodia, in combination with the presence of paleae, makes it unlikely to confuse adult complete specimens of Sosane sulcata with any other Ampharetidae in Norwegian waters.
Holthe T (1986a). Polychaeta Terebellomorpha. Marine Invertebrates of Scandinavia 7: 1-192.
Malmgren AJ (1866). Nordiska Hafs-Annulater. [part three of three]. Öfversigt af Königlich Vetenskapsakademiens förhandlingar, Stockholm 22(5): 355-410, plates XVIII-XXIX. https://biodiversitylibrary.org/page/32339631
Personal observations, Alvestad T.