Ledella messanensis (Jeffreys, 1870)
Nuculanoidea : Nuculanidae
To size: To 5mm. Shell Structure: Moderately solid. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just in front of midline, approximately 40% of total length from anterior end. Becomes more inequilateral with growth. Tumidity: Moderately tumid. Outline: Elongated oval to rounded trigonal with a pointed rostrum: shell height approximately 65-75% of length; antero-dorsal margin slightly convex and moderately steeply sloping; postero-dorsal margin almost straight; rostrum narrowly rounded to almost pointed; postero-ventral margin flexuous; ventral margin deeply rounded. Umbo relatively broad and prominent, projecting above the dorsal margin.
Sculpture: Younger part of shell with very fine, irregular concentric lines. The lines increase in coarseness and prominence towards the outer margins. Margin: Smooth. Ligament: Internal, amphidetic, rounded triangular seated in a well-developed resilifer. Hinge: Taxodont: Broad, robust hinge plate with 8-9 long, solid, blunt chevron-shaped teeth either side of the ligament. Periostracum: Satiny surface with the colour ranging from pale straw to olive green. Colour often darkens towards the outer margins. Colour: Bluey white, inside of shell lustrous. Additional Characters: A single coil on the right side of the body and 4-5 coils on the left side.
Distribution & Ecology
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Nuculanoidea : Nuculanidae
Listed are literature citing Ledella messanensis (Jeffreys, 1870). Reference containing the species Type Description is highlighted.
Allen J A & Hannah F J 1989. Studies on the deep sea Protobrancha (Nuculanidae). Bulletin of the British Museum of Natural History. 55: 123-171.
Jeffreys J.G. 1870. Mediterranean Mollusca. Annals and magazine of natural History. (4) 6: 65-86.
Warén A 1978. The taxonomy of some North Atlantic species referred to Ledella and Yoldiella (Bivalvia). Sarsia. 63: 213-219.
Warén A 1989. Taxonomic comments on some protobranch bivalves from the northeastern Atlantic. Sarsia. 74: 223-259.
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