Pavelius smileyi can be up to 28 mm long. It is only known from Loki Castle vent field, Norwegian Sea at 2350 meters depth.
Loki Castle vent field, Norwegian Sea, 73°33'N 08°09'E, 2350 m.
Measurements: Up to 28 mm long.
Number of thoracic chaetigers: 14
Number of thoracic uncinigers: 11
Number of abdominal uncinigers: 20–21.
Prostomium: Broadly rounded, without lobes or glandular ridges; eyespots absent.
Mouth tentacles: Smooth.
Branchiae: Four pairs of branchiae arranged close together in transverse row without median gap.
Special features: None.
Pygidium: Lateral cirri absent.
Tube: Thin organic layer incrusted with thick layer of mud.
Only known from Loki Castle vent field, Norwegian Sea; 2350 m.
The prostomium without lobes or glandular ridges, in combination with the four pairs of branchiae arranged in a single transverse row, makes it unlikely to confuse adult complete specimens of Pavelius smileyi with any other species of Ampharetidae in Norwegian waters.
Kongsrud JA, Eilertsen MH, Alvestad T, Kongshavn K, Rapp HT (2017). New species of Ampharetidae (Annelida: Polychaeta) from the Arctic Loki Castle vent field. Deep Sea Research Part II: Topical Studies in Oceanography 137: 232-245. http://www.sciencedirect.com/science/article/pii/S096706451630251X