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Most are found in tropical waters
The Rugosa are an extinct group of corals that were abundant in Middle Ordovician to Late Permian seas
There is a large foot with two curved flaps near the head and a single long siphon
They are also abundant on upper reef slopes and in lagoons
Derasa Clam Shell (5”-6”) cauliflower Most are found in tropicalThe Derasa Clam (Tridacna derasa) is the second largest clam of the Tridacna clams. It is also one of the easier clams to care for. This clam can grow to about 20 inches in captivity. They typically have a brown gold coloration with white stripes or spots. It may also have bright blue along the outline of the mantel.
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