Yoldiella insculpta (Jeffreys, 1879)
Nuculanoidea : Nuculanidae |
| Tebble name: | n/a |
| Smith & Heppell name: | Yoldiella insculpta (Jeffreys, 1879) |
Notes on Nomenclature
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:
Almost equilateral, beaks at midline or very slightly behind the midline.
Tumidity:
Moderately inflated.
Outline:
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.
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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.
Depth Range
Bathyal (500 - 2000m)
Additional Information & Related Species
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