Pristigloma nitens (Jeffreys, 1876)
Pristiglomoidea : Pristiglomidae
|Smith & Heppell name:||Pristigloma nitens (Jeffreys, 1876)|
Slightly inequilateral, beaks situated to the anterior of midline, approximately 45% of total length from anterior end.
Sub-circular: width of shell only slightly greater than height. Posterior dorsal margin straight and gently sloping, anterior dorsal margin very short with a sharp angle in front of the umbo. Other margins well rounded. No lunule or escutcheon. Umbo prominent, swollen and raised above the dorsal margin; prodissoconch smooth, conspicuous with defined margin.
Sculpture: Primary sculpture of very fine, regular concentric lines with occasional more prominent growth stops. Also has a sculpture of extremely fine radiating lines. Margin: Smooth. Ligament: Internal, opisthodetic, prominent, elongate, dark brown ligament seated in an elongated groove which runs along the lower part of the posterior hinge plate for about half of its length. Hinge: Taxodont: relatively solid hinge plate separated into 2 distinct parts. Posteriorly the hinge plate is long, relatively narrow and slightly curved, with around 10 slightly raised and pointed chevron-shaped teeth. The anterior part of the hinge plate is short and broad with 4 larger, much less chevron-shaped teeth. Pallial Musculature: Pallial line and muscle scars indistinct. Periostracum: Pale yellowish green with a satiny texture. Colour: Translucent white to bluey grey, inside of shell lustrous. Additional Characters: Four rather elongated loops on either side of the body.
Distribution & Ecology
Found throughout most of the Atlantic deep-sea basins.
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Pristiglomoidea : Pristiglomidae
Listed are literature citing Pristigloma nitens (Jeffreys, 1876). Reference containing the species Type Description is highlighted.
Jeffreys J G 1876. Preliminary report of the biological results of a cruise in HMS Valorous to the Davis Straits in 1875. Proceedings of the Royal Society. 25: 177-237, pls2-4.
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.
Sanders H L & Allen J A 1973. Studies on deep-sea Protobranchia (Bivalvia); prologue and the Pristiglomidae. Bulletin of the Museum of Comparative Zoology, Harvard. 145: 237-262.
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