One such pest, the giant African snail Achatina fulica, has been introduced to many parts of Asia, as well as to many islands in the Indian Ocean and Pacific Ocean. They have structures that allow them to pass water over their gills and filter in suspended food particles. Aj keď toto ochorenie môže postihnúť každého človeka, sú skupiny ľudí, ktoré sú náchylnejšie a vyskytuje sa u nich častejšie. Molluscs are second only to arthropods in numbers of living animal species [17] — far behind the arthropods' 1,113,000 but well ahead of chordates' 52,000. Before the mucus string reaches the prostyle, the acidity of the stomach makes the mucus less sticky and frees particles from it.

Although most helcionellid fossils are only a few millimeters long, specimens a few centimeters long have also been found, most with more limpet-like shapes. The Mollusca phylum is one of the largest and most diverse groups of organisms in the world (second only to the arthropods). The cell lineage of the polyplacophoran, Chaetopleura apiculata: variation in the spiralian program and implications for molluscan evolution". However, the evolutionary history both of molluscs' emergence from the ancestral Lophotrochozoa and of their diversification into the well-known living and fossil forms are still subjects of vigorous debate among scientists. The body of a mollusc has a ventral muscular foot, which is adapted to different purposes (locomotion, grasping the substratum, burrowing or feeding) in different classes.Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

Virus, který je odpovědný za vznik výrůstků, se nachází ve vrchní vrstvě pokožky, proto se nenakazíte kýcháním, kašláním nebo líbáním se. This would have been impermeable and thus forced the development of more sophisticated respiratory apparatus in the form of gills.Schistosomiasis (also known as bilharzia, bilharziosis, or snail fever) is transmitted to humans by water snail hosts, and affects about 200million people.

Volborthella, some fossils of which predate 530million years ago, was long thought to be a cephalopod, but discoveries of more detailed fossils showed its shell was not secreted, but built from grains of the mineral silicon dioxide (silica), and it was not divided into a series of compartments by septa as those of fossil shelled cephalopods and the living Nautilus are. A comparative study of the ultrastructure and mineralogy of calcified land snail eggs (Pulmonata: Stylommatophora)" (PDF). Right of Rectification: is the right of the data subject to the modification of any data that is inaccurate or incomplete. The Bivalvia would comprise about 14% of the total and the other five classes less than 2% of the living molluscs.In 2005, China accounted for 80% of the global mollusc catch, netting almost 11,000,000 tonnes (11,000,000 long tons; 12,000,000 short tons).