Ymerana pteropoda can be up to 5 mm long. It can be found in deep parts of the Norwegian Sea and the Arctic Ocean at depths between 2000 and 4000 meters.
Arctic Ocean, North of Svalbard, 81050’N 26034’E, 3270 m.
Measurements: Up to 5 mm long.
Number of thoracic chaetigers: 14
Number of thoracic uncinigers: 11
Number of abdominal uncinigers: Unknown, at least more than 7.
Prostomium: Trilobed, middle lobe drawn out into horns; eyespots absent.
Mouth tentacles: Smooth.
Branchiae: Three pairs of branchiae in two widely separated groups; branchiae in each group arranged in triangles.
Special features: 14th pair of thoracic notopodia achaetous and transformed into dorsolateral fan with pointed wings laterally connected by low ridge across dorsum.
Deep parts of Norwegian Sea and Arctic Ocean; 2000–4000 m.
The achaetous 14th pair of thoracic notopodia, which is transformed into a dorsolateral fan with pointed wings, makes it unlikely to confuse adult complete specimens of Ymerana pteropoda with any other Ampharetidae in Norwegian waters.
Holthe T (1986b). Polychaeta Terebellomorpha from the northern Norwegian Sea and the Polar Sea, with descriptions of Mugga bathyalis sp.n. and Ymerana pteropoda gen. and sp.n. Sarsia 71: 227-234.
Personal observations, Alvestad T.