Species Account

Yoldiella thaerella 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 3.6mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Equilateral, beaks located at midline. Tumidity: Compressed. Outline: Oval: antero- and postero-dorsal margins almost horizontal; anterior margin rounded with slight oblique truncation of the upper part; upper posterior margin slightly truncated obliquely (smaller specimens the upper posterior margin is rounded); lower posterior margin obliquely truncated or slightly flexuous; ventral margin long, deeply rounded, lowest point posterior of the midline. Umbo centrally placed, narrow, not prominent, projecting just above dorsal margin.

Sculpture: Very weak striations. Margin: Smooth. Ligament: Amphidetic, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Relatively long and narrow. Hinge: Taxodont: Hinge plate characteristically weak, very narrow for the size of shell; blunt chevron-shaped teeth, up to 6-7 posterior and 5-6 anterior. Periostracum: Silky, pale straw coloured. Colour: Translucent white. Additional Characters: The hind-gut forms a rounded triangular shaped loop on the right side of the body, frequently with an indentation along the ventral side.

Distribution & Ecology

Slopes of Rockall Trough in depths ranging from 1270 to 2900m.
Western European Basin (including Rockall Trough) from latitudes of 43°N to 58°N, and at depths of 1719-4829m (most commonly in 2400-3000m), and in the North America Basin in depths of 1102-4400m.

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

Additional Information & Related Species


Listed are literature citing Yoldiella thaerella 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