Bentharca asperula (Dall 1881)
Arcoidea : Arcidae |
| Tebble name: | n/a |
| Smith & Heppell name: | n/a |
To size:
To 10mm.
Shell Structure:
Thin, opaque.
Equivalve:
Equivalve.
Equilateral:
Inequilateral, beaks at about 1/4 length of dorsal margin from anterior.
Tumidity:
Not inflated.
Outline:
Trapezoidal – wedge shaped, posterior greatly expanded, umbos low; dorsal margin long, straight; posterior margin broadly rounded; ventral and anterior margins continuous gently curved with a prominent byssus indentation; anterior roundly pointed.
Contour:
Posterior angle indistinct; median area with byssal sinus; dorsal area narrow, flat.
Sculpture:
Weak, primarily of well spaced, comarginal, low ridges these cut by radial rows of bristle insertion marks.
Margin:
Inner margin smooth.
Ligament:
Duplivincular, v-shaped ligament bands arising from posterior of dorsal area at first, then between beaks.
Hinge:
Taxodont, teeth very small, in two series separated by an edentulous space, set on a narrow straight hinge plate; up to 5 anterior and 6 posterior teeth; anterior set angled obliquely, posterior set subparallel to dorsal margin.
Pallial Musculature:
Adductor scars unequal, anterior is smaller than posterior.
Periostracum:
Of brown to dark brown bristles over the posterior area, as frills on median and anterior.
Colour:
White.
Distribution & Ecology
Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)
Abyssal Plain (4000m +)
Additional Information & Related Species
References
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