Species Account

Yoldiella valorousae Killeen & Turner, 2009

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: n/a

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 4.4mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Moderately inequilateral, the beaks lie approximately 40% of dorsal margin length from anterior. Tumidity: Slightly tumid. Outline: Elongate-oval: postero-dorsal margin long, gently sloping; antero-dorsal margin sloping more steeply; posterior margin broadly rounded; anterior margin rounded with the extremity situated above the horizontal midline; ventral margin deeply rounded, lowest point posterior of midline. Umbo small, not prominent, projecting just above the dorsal margin, and lies anterior of midline.

Sculpture: Very weak concentric striations. Margin: Smooth. Ligament: Amphidetic, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Relatively short. Hinge: Taxodont: Hinge long, narrow with 8-10 posterior and 7-9 anterior, chevron-shaped, teeth on either side of the ligament. Pallial Musculature: Posterior adductor muscle scar rounded. Periostracum: Silky, pale straw coloured. Colour: Translucent white. Additional Characters: The hind-gut lies on the right side of the body. It runs along the antero-dorsal margin then clockwise up towards the umbo then turning anticlockwise and then back on itself.

Distribution & Ecology

Most records from the slopes of Rockall Trough in depths ranging from 1050 to 2200m.
Western European Basin from latitudes of 43°N to 58°N, and at depths of 1491-3220 m. Also known from the Canaries and Sierra Leone Basins.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species


Listed are literature citing Yoldiella valorousae Killeen & Turner, 2009. Reference containing the species Type Description is highlighted.

Killeen I.J. & Turner J. 2009. Yoldiella and Portlandia (Bivalvia) from the Faroe-Shetland Channel and Rockall Trough, Northeast Atlantic. Journal of Conchology. 39 (6): 733-778.


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Record last modified: 22/03/2016