Species Account

Yoldia hyperborea (Gould, 1841)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Yoldia hyperborea Torell, 1859

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 50 mm. Shell Structure: Thin but robust. Equivalve: Equivalve. Equilateral: Subequilateral, beaks just behind midline. Tumidity: Compressed. Outline: Elongate elliptical, posteriorly subrostrate; dorsal margins long sloping gently; anterior narrowly rounded; ventral gently curved, posterior ventral sloping obliquely up to narrow blunt extremity.

Sculpture: Smooth with fine concentric lines and growth stops. Margin: Inner margin smooth. Ligament: Internal, set on a small triangular resilifer below the beaks. Hinge: Taxodont, largest shells with c.35 anterior teeth and c.30 posterior teeth, teeth in centre of each series the largest. Pallial Musculature: Pallial sinus subacute, almost extending to line beneath the beaks. Periostracum: Persistent, very glossy, shades of olive green to brownish green. Colour: Shell white.

Distribution & Ecology

A subarctic species extending southward to Iceland. Mostly taken from outer shelf depths beyond 100m. Not yet recorded from the British area.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species


Listed are literature citing Yoldia hyperborea (Gould, 1841). Reference containing the species Type Description is highlighted.

Torell O M 1859. Bidrag till Spitsbergen Mollusk-fauna. Jemte en allman oversigt af Arktiska regionens naturforahallanden och forntida ubtredning Boktrycheri, Stocholm. 118.


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Record last modified: 22/03/2016