Malletia johnsoni Clark, 1961
Nuculanoidea : Malletiidae
Inequilateral, beaks situated to the anterior of midline, approximately 35% of total length from anterior end.
Moderately inflated but rather compressed posteriorly.
Rounded rectangular: antero-dorsal margin short, gently sloping; anterior end rounded; postero-dorsal margin long, straight and slightly raised, with a slight dorsal margin - posterior margin junction; posterior end broad, slightly rounded to almost truncated. Ventral margin long, very shallowly rounded to almost straight. Umbo narrow, slightly pointed and raised above the dorsal margin.
Sculpture: Virtually smooth, with only very faint, closely spaced concentric lines. Margin: Smooth. Ligament: External, exterior part long, at least half the length of the postero-dorsal margin, prominent, raised, straw-coloured; anterior part narrow and not raised. Hinge: Taxodont: Hinge plate rather narrow but broadening away from the umbos; straight in the posterior part and sloping in the anterior part; moderately pointed chevron-shaped teeth, up to 36 posterior and 16-20 anterior. Resilium. Pallial Musculature: Pallial sinus broad and deep, extending approximately half way across the shell. Periostracum: Glossy, slightly iridescent, greyish to slightly greenish, sometimes browner around the outer margins (especially the anterior end). Colour: Translucent white. Additional Characters: The hind-gut forms a simple, rounded loop on the right side of the body.
Distribution & Ecology
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Nuculanoidea : Malletiidae
Listed are literature citing Malletia johnsoni Clark, 1961. Reference containing the species Type Description is highlighted.
Clark A H Jr 1961. Abyssal mollusks from the South Atlantic Ocean. Bulletin of the Museum of Comparative Zoology, Harvard. 125: 345-387.
Sanders H.L. & Allen J.A. 1985. Studies on deep sea Protobranchia (Bivalvia): the family Malletiidae. Bulletin of the Natural History Museum, London (Zoology). 49: 195-238.
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