Overview

Comprehensive Description

At cold seeps and hot vents. The specimens live buried in the sediment but with the posterior part (2/3 of shell length) free, they are inclined at about 50° to the sediment surface and are capable of moving around by means of their large muscular foot, leaving short tracks in the sediment.
  • COAN E.V., SCOTT P.V. & F.R. BERNARD (2000) in COAN E.V., SCOTT P.V. & F.R. BERNARD (Eds.) Bivalve Seashells of Western North America: 336-343.

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Distribution

Gorda Ridge (hydrothermal vents); Monterey Canyon: 36°35?N, 122°30?5??W, 3041 m (cold seeps).
  • COAN E.V., SCOTT P.V. & F.R. BERNARD (2000) in COAN E.V., SCOTT P.V. & F.R. BERNARD (Eds.) Bivalve Seashells of Western North America: 336-343.

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Physical Description

Morphology

Shell very large and very elongate, thick, slightly inequivalve, somewhat irregular, bean-shaped, curved with markedly concave ventral margin and somewhat convex dorsal margin, gaping anteriorly and posteriorly. Umbones not prominent, prosogyrous, situated anteriorly at 1/6 of shell length. Surface with low growth ridges, periostracum brownish-olive, persistent only posteriorly and near margins. Hinge plate rather narrow but strong, with three cardinals in the left valve and two cardinals in the right valve.
  • COAN E.V., SCOTT P.V. & F.R. BERNARD (2000) in COAN E.V., SCOTT P.V. & F.R. BERNARD (Eds.) Bivalve Seashells of Western North America: 336-343.

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Size

Shell length up to 246 mm.
  • COAN E.V., SCOTT P.V. & F.R. BERNARD (2000) in COAN E.V., SCOTT P.V. & F.R. BERNARD (Eds.) Bivalve Seashells of Western North America: 336-343.

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Ecology

Habitat

Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 2697 - 2697
  Temperature range (°C): 1.771 - 1.771
  Nitrate (umol/L): 39.961 - 39.961
  Salinity (PPS): 34.634 - 34.634
  Oxygen (ml/l): 1.944 - 1.944
  Phosphate (umol/l): 2.903 - 2.903
  Silicate (umol/l): 175.643 - 175.643
 
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