Mollusc

Mollusca is the second largest phylum of invertebrate animals. The members are known as molluscs or mollusks (/ˈmɒləsk/). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species.

Characteristics

Molluscs are a diverse group, with the highest diversity occurring in marine environments. They have a wide range of forms, from large predatory squid and octopus, to small grazing forms with elaborately sculpted and colored shells.

Anatomy

Molluscs have a specific body plan which includes a mantle that secretes calcium carbonate to form a shell, a muscular foot, and a radula for feeding.

Classification

Molluscs are classified into several groups (taxa). The most common system divides molluscs into eight classes.

Evolution

The fossil record of molluscs is relatively complete, and they are well represented in most marine and freshwater environments.

Human interaction

Molluscs have been used by humans for food, ornamentation, and as currency. Some species are also harmful to humans, as they can be vectors for diseases.

See also

• List of mollusc orders
• Mollusc shell
• Molluscicide

External links

• Molluscs at molluscs.at

Mollusc Resources
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