Species Account

Portlandia arctica (J E Gray, 1824)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Portlandia arctica (J E Gray, 1824)

Notes on Nomenclature

Nuculanidae in place of Yoldiidae
Killeen & Turner (2009) use Nuculanidae instead of Yoldiidae in agreement with Ockelmann & Warén (1998) who explan that the distinguishing characters between these two families has never been well documented. Until the Yoldiidae can be clearly distinguished from the Nuculanidae we shall treat them under the single family Nuculanidae.

To size: To 15 mm. Shell Structure: Rather thin, brittle. Equivalve: Equivalve. Equilateral: Inequilateral, beaks just in front of midline. Tumidity: Moderate. Outline: Sub-elliptical, posterior subrostrate; dorsal margins immediately adjacent to umbos slightly sunken; anterior broadly curved; ventral gently curved; posterior dorsal margin sloping, straight; posterior pointed; posterior ventral slightly concave. Contour: Umbos prominent; posterior set off by a rounded ridge running from beaks to posterior margin, a radial sulcus ventral to the ridge. Edge of escutcheon raised.

Sculpture: Smooth with faint concentric line and growth stops. Margin: Inner margin smooth. Ligament: Internal set on a triangular resilifer that projects into the umbonal cavity. Hinge: Taxodont of numerous pointed teeth. Periostracum: Persistent, rather shiny, olive brown to golden brown in colour. Colour: Shell white.

Distribution & Ecology

A high arctic species living in Greenland, Svalbard and northern Norway but not in Iceland. Records further south are most likely subfossil. The status of the single record from the Minch, NW Scotland (see NBN Gateway) is uncertain.

Depth Range
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species


Listed are literature citing Portlandia arctica (J E Gray, 1824). Reference containing the species Type Description is highlighted.

Gray J E 1824. Shells. In: Parry W.E. (ed.) Supplement to Appendix, Parry's Voyage for the Discovery of a north-west passage in the years 1819-1820, containing an account of the subjects of Natural History London, John Murray. Appendix 10, Zool: 240-246.


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Record last modified: 22/03/2016