Ampharete lindstroemi can be up to 12 mm long. It can be found along the entire Norwegian coast at depths between 8 and 2000 meters.

Type locality

Bohuslän, Sweden.

Key characters

Measurements: Up to 12 mm long.

Number of thoracic chaetigers, excluding paleae: 14

Number of thoracic uncinigers: 12

Number of abdominal uncinigers: 12

Prostomium: Trilobed; one to three pairs of eyespots.

Mouth tentacles: Papillose.

Branchiae: Four pairs of branchiae in two groups separated by distance equal to one branchial base diameter; three branchiae in each group in transverse row, fourth branchia behind middle one of the three; branchial bases on each side fused.

Paleae: Long with filiform tips; 7–10 chaetae on each side.

Special features: None.

Pygidium: With two long lateral cirri and several small rounded papillae; one pair of eyespots present.

Tube: Thin layer of organic secretion covered with a loose layer of mud with attached shell fragments.

Distribution

Entire Norwegian coast; 8 m (Holthe 1986a) to 2000 m (own observations).  

Remarks

As reported by Jirkov (2001) A. lindstroemi is a species complex. Based on our unpublished data, A. lindstroemi is represented by two genetic clades in Norwegian waters.

Similar species

Ampharete lindstroemi is very similar to Ampharete baltica. The shape of the pygidial papillae, short rounded in the former or long cirriform in the latter, is the only good character to differentiate these two species, which make specimens without pygidium very hard to identify correctly.

Sources

Hessle C (1917). Zur Kenntnis der terebellomorphen Polychaeten. Zoologiska bidrag från Uppsala 5: 39-258, plates I-V. https://biodiversitylibrary.org/page/38891407

Holthe T (1986a). Polychaeta Terebellomorpha. Marine Invertebrates of Scandinavia 7: 1-192.

Malmgren AJ (1867). Annulata Polychaeta Spetsbergiæ, Grœnlandiæ, Islandiæ et Scandinaviæ. Hactenus Cognita. Ex Officina Frenckelliana, Helsingforslæ 127 pp. & XIV plates. http://www.biodiversitylibrary.org/bibliography/13358

Personal observations, Alvestad T.