Paramytha schanderi can be up to 18 mm long. It is only known from Loki Castle vent field, Norwegian Sea at 2350 meters depth.

Type locality

Loki Castle vent field, Norwegian Sea, 73°3'N 08°09'E, 2350 m.

Key characters

Measurements: Up to 18 mm long.

Number of thoracic chaetigers: 15

Number of thoracic uncinigers: 12

Number of abdominal uncinigers: 18–20.

Prostomium: Not sub-divided into lobes, almost rectangular in shape and with wide anterior thickened margin; eyespots absent.

Mouth tentacles: Smooth.

Branchiae: Four pairs of branchiae; two anterior pairs arranged closely together in transverse row without median gap, two following pairs of branchiae in oblique longitudinal row.

Paleae: Absent.

Special features: None.

Pygidium: Lateral cirri absent.

Tube: Thin transparent layer of organic secretion incrusted with fine-particulate material, pieces of polychaete tubes and small shell fragments.

Distribution

Only known from Loki Castle vent field, Norwegian Sea; 2350 meters depth.

Similar species

The species has a prostomium without lobes or glandular ridges, and four pairs of branchiae not arranged in a single transverse row, but rather two anterior pairs arranged closely together in transverse row without median gap, and the two following pairs of branchiae in a oblique longitudinal row. This combination of characters makes it unlikely to confuse adult complete specimens of Paramytha schanderi with any other Ampharetidae in Norwegian waters.

Sources

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