Malacology

* (Cymatiidae), C.*Chicoreus brevifrons* (Muricidae) D.*Tonna galea* (Tonnidae), E.*Nerita pelotonta* (Neritidae), F. *Tonna maculosa* (Tonnidae), G.*Turbinella angulata* (Turbinellidae), H.*Turritella variegata* (Turritellidae), I.*Vasun muricatum* (Turbinellidae).]]

**Malacology** is the study of molluscs. These animals include snails, slugs, octopus, squid, and bivalves generally, such as clams and mussels. Most of them have shells. The shells are often collected for their beauty and interest. Many people eat molluscs, especially those people who live near the ocean.

Those scientists who study molluscs are called *malacologists*. They identify and classify them, and find out everything they can about their lives.

## Types 
### Types of gastropods 
The gastropods are the most common type of mollusc. They have about 70,000 described species.
* marine gastropod
** sea snail
** sea slug
* non-marine gastropod
** freshwater gastropod: with very few exceptions, the only freshwater molluscs are freshwater snails
*** freshwater snail
** terrestrial gastropod: gastropods are the only group of molluscs which have some species living on land
*** land snail
*** land slug
*** semi-slug

### Types of bivalves 
With 20,000 described species, bivalves are the second commonest class of molluscs. There are several classifications of bivalves in use. This is a rough guide:
*Pteromorphia including the
**File shells
**Mussels
**Oysters
**Pearl oysters and pen shells
*Heterodonta
**Soft-shelled clams
**Shipworms (*Turedo'')
**Hard-shelled clams, cockles and razor shells

## Malacologists
* Horace Burrington Baker (1889–1991)
* Henri Marie Ducrotay de Blainville (1777-1850)
* Jean Guillaume Bruguière (1749-1798) 
* William J. Clench (1897-1984)
* Georges Cuvier (1769-1832)
* Gérard Paul Deshayes (1795-1875)
* John Edward Gray (1800-1875) 
* Otto Friedrich Müller (1730-1784) 
* Alcide d'Orbigny (1802-1857)
* Isabel Pérez Farfante (1916-2009)
* Constantine Samuel Rafinesque (1783-1840)
* Lovell Augustus Reeve (1814-1865)
* María Isabel Scott Hylton (1889-1990)
*James Sowerby (1757–1822)
* George Brettingham Sowerby I (1788-1854) 
* George Brettingham Sowerby II (1812-1884) 
* George Brettingham Sowerby III (1843-1921) 
* William Swainson (1789-1855)

## Museums 
Museums that have either exceptional malacological research collections (behind the scenes) and/or exceptional public exhibits of molluscs:

* Academy of Natural Sciences of Philadelphia
* American Museum of Natural History
* Bailey-Matthews Shell Museum
* Cau del Cargol Shell Museum
* Museum of Comparative Zoology at Harvard
* Royal Belgian Institute of Natural Sciences, Brussels: with a collection of more than 9 million shells (mainly from the collection of Philippe Dautzenberg)
* Smithsonian Institution

## Some mollusks 
 Image:Acanthopleura_granulata_with_Nerita_tessellata.jpg|two ***chitons*** with small sea snails
Image:Cassidae sp.jpg|***sea snail***
Image:Limax cinereoniger.JPG|***land slug***
Image:Snail black on grass2.jpg|***land snail***
Image:Mya arenaria.jpg|***marine clam***
Image:Unknown_Unionidae_4.jpg|***freshwater clam***
Image:Octo2.jpg|***octopus***
Image:Sepiotenthis lessoniana.jpg|***squid***

## References