Bathyarca frielei (Friele, 1877)
Arcoidea : Arcidae
Thin, fragile, semi-transparent.
Slightly inequivalve, left valve larger, right valve sitting inside left valve.
Inequilateral, beaks just in front of midline.
Roundly wedge-shaped (length only slightly greater than height), umbos low. Dorsal margin long, straight; posterior broadly rounded, merging into obliquely sloping ventral margin byssus indentation indistinct; anterior narrowly rounded.
Dorsal area narrow, edge of hinge plate raised; posterior angle indistinct, rounded.
Sculpture: Very weak, reticulate, numerous radial raised lines dominant over numerous comarginal ridges; sculpture more prominent on the smaller right valve. Margin: Inner margin of larger left valve weakly crenulate adjacent to a submarginal groove; right valve smooth. Hinge: Very weak, taxodont, teeth in two series set on a gently curved hinge plate, anterior set with up to 5 teeth, posterior set up to 5; posterior teeth subparallel to dorsal margin anterior teeth oblique. Pallial Musculature: Obscure but anterior adductor scar slightly smaller than posterior. Periostracum: Of fragile, pale straw coloured, very short bristles in a primarily radial arrangement. Colour: White, semitransparent.
Distribution & Ecology
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Additional Information & Related Species
Key Features & Similar Species
Arcoidea : Arcidae
Listed are literature citing Bathyarca frielei (Friele, 1877). Reference containing the species Type Description is highlighted.
Bouchet P. & Warén A 1979. The abyssal molluscan fauna of the Norwegian Sea and its relation to other faunas. Sarsia. 64: 211-243.
Friele H 1877. Preliminary report on Mollusca from the Norwegian North Atlantic Expedition in 1876. Nyt Mag. naturvid. 23: 1-10.
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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