Species Account

Bathyarca frielei (Friele, 1877)

Arcoidea : Arcidae

Tebble name: n/a
Smith & Heppell name: Bathyarca frielei (Friele, 1877)

To size: To 5mm. Shell Structure: Thin, fragile, semi-transparent. Equivalve: Slightly inequivalve, left valve larger, right valve sitting inside left valve. Equilateral: Inequilateral, beaks just in front of midline. Tumidity: Not inflated. Outline: 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. Contour: 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

Attached to sediment particles by a weak stalked byssus. At lower slope and abyssal depths. An Arctic deep water species extending into the Faroe-Shetland Channel.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)

Additional Information & Related Species

Key Features & Similar Species

Most similar to small B. pectunculoides but with a weaker sculpture and found at greater depths.

Related Species


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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Record last modified: 22/03/2016