Derasa Clam Shell (5”-6”) cauliflower These mollusks are carnivores

These mollusks are carnivores

The Rugosa are an extinct group of corals that were abundant in Middle Ordovician to Late Permian seas

Their surface is smooth with thick tissue

but there are also cold water species

There is a large foot with two curved flaps near the head and a single long siphon

Derasa Clam Shell (5”-6”) cauliflower These mollusks are carnivoresThe 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.