Yoldiella insculpta (Jeffreys, 1879)
Nuculanoidea : Nuculanidae
Almost equilateral, beaks at midline or very slightly behind the midline.
Oval; postero- and antero-dorsal margins short, horizontal; posterior and anterior margins broadly rounded; ventral margin deeply rounded. Umbo broad, prominent above the dorsal margin, located at, or very slightly anterior of the midline.
Sculpture: Fine, regular, well-defined concentric striations, faint radial striations are present (particularly on the posterior end) in some larger individuals. Margin: Smooth. Ligament: Amphidetic, small, rounded, projecting slightly below the hinge plate, attached internally to the underside of the beak without a projecting chondrophore or resilifer. Hinge: Taxodont: relatively long, narrow, slightly curved, 8-12 small chevron-shaped teeth on either side of the ligament. Periostracum: Silky. Colour: Translucent white. Additional Characters: The hind-gut lies on both sides of the body and forms three tight coils on the right side and two on the left.
Distribution & Ecology
West European Basin, mostly from a small geographic area around 47°30’N, 08°40’W in depths from 1913-2360m, and in the Canaries Basin in depths from 1934-3301m.
Bathyal (500 - 2000m)
Additional Information & Related Species
Nuculanoidea : Nuculanidae
Listed are literature citing Yoldiella insculpta (Jeffreys, 1879). 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.
Jeffreys J.G. 1879. On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ Expeditions, 1868-70. (Part II). Proceedings of the Zoological Society of London. 1879: 553-588.
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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