Species Account

Yoldiella fabula Allen, Sanders & Hannah, 1995

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 3.1mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Slightly inequilateral, the beaks lie 40-45% of dorsal margin length from anterior. Tumidity: Moderately inflated. Outline: Elongate-oval- ‘bean-shaped’: dorsal margins gently curved and slightly crimped; anterior and posterior margins rounded; ventral margin long, shallowly rounded. Umbo relatively broad, prominent, projecting above the dorsal margin, situated posterior of midline.

Sculpture: Fine, regular striations, coarser towards the ventral margin. Margin: Smooth. Ligament: Slightly opisthodetic, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Hinge: Taxodont: long, curved, relatively strong, v-shaped; 7-8 posterior and 8-9 anterior, chevron-shaped teeth on either side of the ligament. Periostracum: Silky, yellowish in colour. Colour: Translucent white. Additional Characters: The hind-gut forms a simple, rounded loop on the right side of the body.

Distribution & Ecology

Y. fabula occurred frequently in the Challenger material from Rockall Trough in depths ranging from 1510-2900m, but was present in low numbers.
et al. (1995) record Y. fabula from most of the Atlantic deep-sea basins in depths ranging from 2503-5223m, including 2 stations in Rockall Trough.

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

Additional Information & Related Species


Listed are literature citing Yoldiella fabula Allen, Sanders & Hannah, 1995. 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.
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