Bathyarca glacialis (J E Gray, 1824)
Arcoidea : Arcidae
To size: To 15mm. Shell Structure: Thin but not fragile, opaque. Equivalve: Slightly inequivalve, left valve slightly larger, right valve sitting inside left valve. Equilateral: Inequilateral, beaks in front of midline at about 1/3 the length of the dorsal margin from the anterior. Tumidity: A little tumid. Outline: Oblong, posteriorly expanded, umbos prominent; dorsal margin long, straight; posterior broadly rounded, ventral gently curved; anterior narrower than posterior, rounded. Contour: Dorsal area narrow, flat but rising towards junction of valves; posterior angle indistinct; median area with a shallow sinus only in smaller shells.
Sculpture: Primarily radial of numerous fine riblets, these interrupted by growth stops. Margin: Inner margin of larger left valve weakly crenulate adjacent to a submarginal groove; right valve smooth. Ligament: Duplivincular, chevrons developing from the posterior of the dorsal area. Hinge: Taxodont, teeth in two series set on a gently curved hinge plate, separated by a distinct edentulous space; anterior set with up to 6 teeth, posterior set up to 9; posterior teeth longer and set more obliquely than anterior teeth. Pallial Musculature: Anterior adductor scar about 2/3 size of posterior. Colour: White.
Distribution & Ecology
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Arcoidea : Arcidae
Listed are literature citing Bathyarca glacialis (J E Gray, 1824). Reference containing the species Type Description is highlighted.
Gray J E 1824. Shells. In: Parry W.E. (ed.) Supplement to Appendix, Parry's Voyage for the Discovery of a north-west passage in the years 1819-1820, containing an account of the subjects of Natural History London, John Murray. Appendix 10, Zool: 240-246.
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.
Oliver G & Allen J A 1980. The Functional and Adaptive Morphology of the Deep-Sea Species of the Arcacea (Mollusca: Bivalvia) from the Atlantic. Philosophical Transactions of the Royal Society of London Series B. 291: 45-76.
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