16 Tonicella marmorea

16 Tonicella marmorea

Anterior view of intermediate valve under high magnification of Scanning Electron Microscope (SEM). Barents Sea, Arctic. © B. Sirenko.
The side slopes of valves ii to vii are straight (1 to 1) or slightly convex, or a combination of straight and convex when viewed from the anterior or posterior.
Height of arch is 33.5% of its width.

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