A live Pen Shell in the Genus Atrina. Either A. rigida or A. seminuda. Not sure if it is possible to distinguish for sure without seeing the interior surface.
These large clams usually lie buried with their pointed ends deep in the ground and their razor-sharp edges facing upwards. These bivalves are listed among the threatened animals of Singapore.
More about this clam on the wildfacts sheets on wildsingapore.
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This animal with a T-shaped shell is a bivalve! It is quite commonly seen on Cyrene Reefs.
More about this bivalve on the wildfacts sheets on wildsingapore.
For a high res version of this photo, please review the details on about using my photos. When making the request, please include this reference: 090109cyrd4647
Pterioida is an order of large and medium-sized saltwater clams, marine bivalve mollusks. It includes five families, among them the Pteriidae (pearl oysters and winged oysters)
