Species Account

Yoldiella jeffreysi (Hidalgo, 1877)

Nuculanoidea : Nuculanidae

Tebble name: n/a
Smith & Heppell name: Yoldiella jeffreysi (Hidalgo, 1877)

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 3.7mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just in front of midline. Tumidity: Moderately tumid. Outline: Rounded oval: postero-dorsal and antero-dorsal margins gently sloping; posterior and anterior margins broadly rounded; ventral margin deeply rounded with the lowest point slightly posterior to the midline. Umbo prominent, moderately broad, projecting just above the dorsal margin, anterior of the midline.

Sculpture: Smooth. Margin: Smooth. Ligament: Amphidetic, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Relatively short. Hinge: Hinge plate long, narrow, with 8-10 posterior and 7-9 anterior, pointed, chevron-shaped teeth on either side of the umbo. Pallial Musculature: Posterior adductor muscle scar elongate-rounded. Periostracum: Silky, pale straw coloured. Colour: Translucent white. Additional Characters: The hind-gut lies on the right side of the body and forms a complex series of clockwise and anticlockwise coils.

Distribution & Ecology

From the southern part of Rockall Trough to the Wyville Thomson Ridge, in depths ranging from 862 to 2900m.
Found in most of the Atlantic deep-sea basins, including many locations in the Western European Basin, especially Rockall Trough from latitudes of 44°N to 58°N, and at depths of 2040-4862m. Also recorded from western Greenland, the Gulf of Mexico and the Mediterranean off Palermo.

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

Additional Information & Related Species


Listed are literature citing Yoldiella jeffreysi (Hidalgo, 1877). Reference containing the species Type Description is highlighted.

Allen, J.A., Sanders, H.L. & Hannah, F. 1995. Studies on the deep-sea Protobranchia (Bivalvia); the subfamily Yoldiellinae. Bulletin of the British Museum of Natural History. 61: 11-90.
Hidalgo J G 1870-1890. Moluscos marinos de España, Portugal y las Baleares, tom. 1-4 C. Bailly-Baillere, Madrid.
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.
Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31.


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Record last modified: 22/03/2016