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Pinna sp.
This bivalve mollusk was about 18-20cm long, with an elongated, wedge-shaped shell. It was anchored in the substrate, with about three-fourths of the shell exposed.
I was surprised to find this pen shell at this dive site (Dayang Beach, Talikud Island) -- it was the first time for me to see one after nearly a hundred dives there. It was in about 12m of water.
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