Molluscs

Molluscs or mollusks are a large and diverse group of invertebrates that includes over 85,000 known species. They are the second largest group of invertebrates, after the arthropods. Molluscs are found in nearly all environments on Earth, from the deepest oceans to the highest mountains, and they have a wide range of forms and functions.

Classification

Molluscs are classified into several major groups, known as classes. These include the Gastropoda (snails and slugs), Bivalvia (clams, oysters, and other bivalves), Cephalopoda (squid, octopuses, and cuttlefish), and several smaller classes.

Anatomy

Molluscs have a wide range of body forms, but all share certain basic features. These include a soft body, usually protected by a hard shell, and a muscular foot used for locomotion. Many molluscs also have a radula, a unique feeding organ not found in any other group of animals.

Ecology

Molluscs play important roles in many ecosystems. They are a major food source for many animals, and some species are important predators. Many molluscs are also filter feeders, helping to clean the water in which they live.

Human use

Molluscs have been used by humans for thousands of years, for food, tools, and decoration. Today, they are also important in aquaculture and fisheries, and some species are kept as pets.

Conservation

Many species of molluscs are threatened by habitat loss, pollution, and overharvesting. Conservation efforts are underway to protect these species and their habitats.