Bathyarca pectunculoides (Scacchi, 1835)
Arcoidea : Arcidae
Thin but not fragile, opaque.
Inequivalve, left valve noticeably larger, right valve sitting inside left valve.
Almost equilateral, beaks just in front of midline.
Roundly wedge-shaped (length only slightly greater than height), umbos prominent. Dorsal margin long, straight ; posterior broadly rounded, some obliquely subtruncate merging into obliquely sloping almost straight ventral margin invariable with a distinct byssus indentation; anterior narrowly rounded.
Dorsal area narrow, edge of hinge plate raised; posterior angle indistinct, rounded.
Sculpture: Weakly 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. Ligament: Duplivincular, chevrons developing from the posterior of the dorsal area. Hinge: 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: Anterior adductor scar slightly smaller than posterior. Periostracum: Of fragile, pale straw coloured, very short bristles. Colour: White.
Distribution & Ecology
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Key Features & Similar Species
Arcoidea : Arcidae
Listed are literature citing Bathyarca pectunculoides (Scacchi, 1835). Reference containing the species Type Description is highlighted.
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.
Scacchi A 1835. Notizie intorno alle conchiglie ed a’zoofiti fossili che si trouvano nelle vicinanze Gravina in Puglia. Annali Civili del Regno delle Due Sicilie. 6: 75-84.
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