Mollusks

Mollusks are a diverse group of invertebrate animals that belong to the phylum Mollusca. They are found in marine, freshwater, and terrestrial environments and include familiar animals such as clams, snails, slugs, and octopuses.

Anatomy of Mollusks

Mollusks have a soft body that is often protected by a hard shell. Their body plan typically includes a muscular foot, a visceral mass containing the internal organs, and a mantle that may secrete the shell. Mollusks also have a radula, a feeding organ with tiny, rasping teeth.

Classification of Mollusks

Mollusks are classified into several classes, including:

Gastropods: These include snails and slugs and are known for their characteristic coiled shells.
Bivalves: This class includes clams, mussels, and oysters, which have two hinged shells.
Cephalopods: Octopuses, squids, and nautiluses belong to this class and are known for their well-developed heads and tentacles.
Others: The mollusk phylum also includes other classes such as chitons and monoplacophorans.

Ecological Importance

Mollusks play important ecological roles. They are an essential part of the food web, serving as both predators and prey. Some mollusks, such as oysters and mussels, are also important filter feeders, helping to improve water quality by removing particles and excess nutrients from the water.