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[edit | edit source]
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[edit | edit source]
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[edit | edit source]
Molluscs are classified into several groups (taxa). The most common system divides molluscs into eight classes.
Evolution[edit | edit source]
The fossil record of molluscs is relatively complete, and they are well represented in most marine and freshwater environments.
Human interaction[edit | edit source]
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[edit | edit source]
References[edit | edit source]
External links[edit | edit source]
- Molluscs at molluscs.at
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