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In page Pinna carnea:
"The amber pen shell may reach 30 cm (12 in) in length [5] with shell growth being extremely rapid after settlement (up to 2.2 mm (0.087 in) in length/day) and growth slowing down as shells get large and attain a refuge in size (at around 15 cm (5.9 in)).[6] The exposed valves of amber penshells are subject to frequent damage as they often show breaks and scars. While its half-buried position facilitates filtering water from above silty bottoms, it also increases exposure to predators. Octopuses are likely important predators of amber pen shells.[8]
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