Ledella ultima (E A Smith, 1885)
Nuculanoidea : Nuculanidae
Moderately solid becoming massive.
Slightly inequilateral, beaks just behind midline.
Moderately tumid, becoming obese.
Oval with a short rostrum: antero-dorsal margin sloping; postero-dorsal margin almost straight and sloping; rostrum subtruncate; postero-ventral margin flexuous; ventral margin deeply rounded. Umbo relatively broad and prominent, projecting above the dorsal margin.
Rostrum with a distinct keel.
Sculpture: Of evenly spaced fine, co-marginal ridges. Smoother over the umbo. Margin: Smooth. Ligament: Internal, amphidetic, oval, seated in a relatively broad resilium beneath the beaks. Hinge: Taxodont: Hinge plate relatively solid, becoming massive in obese shells. Robust, blunt, short chevron-shaped teeth, approximately 6-8 either side of the ligament. Pallial Musculature: In obese shells adductor muscle scars deeply impressed. Periostracum: Thin, smooth, greyish green, becoming yellowish with age. Colour: White. Additional Characters: Gut loop with multiple tight coils on the right side.
Distribution & Ecology
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Abyssal Plain (4000m +)
Additional Information & Related Species
Nuculanoidea : Nuculanidae
Listed are literature citing Ledella ultima (E A Smith, 1885). Reference containing the species Type Description is highlighted.
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.
Smith E A 1885. Report on the Lamellibranchiata collected by HMS Challenger during the years 1873-1876. Reports of the scientific results of the voyage of HMS “Challenger”, Zoology. 13 (35): 1-341, 25pls.
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