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Что (кто) такое mollusk$49896$ - определение
FEATURE OF GASTROPOD, NAUTILUS AND AMMONITE SHELL ANATOMY
Umbilicus (mollusk)
![The wide and deep umbilicus of ''[[Cittarium pica]]'' is easily visible on the underside of the shell.](https://commons.wikimedia.org/wiki/Special:FilePath/Cittarium pica umbilicus.jpg?width=200 "The wide and deep umbilicus of ''[[Cittarium pica]]'' is easily visible on the underside of the shell.")
![Allonautilus scrobiculatus]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Nautilus umbilicus- Allonautilus scrobiculatus.png?width=200 "Allonautilus scrobiculatus]]''")
![The shell of ''[[Neverita josephinia]]'' has an umbilical callus which almost completely fills the umbilicus, leaving only a groove, and a chink on one side.](https://commons.wikimedia.org/wiki/Special:FilePath/Neverita josephinia 000.JPG?width=200 "The shell of ''[[Neverita josephinia]]'' has an umbilical callus which almost completely fills the umbilicus, leaving only a groove, and a chink on one side.")
Mollusc shell
![Petricola pholadiformis]]''. A [[bivalve shell]] is composed of two hinged valves which are joined by a ligament.](https://commons.wikimedia.org/wiki/Special:FilePath/Amerikanische Bohrmuschel.JPG?width=200 "Petricola pholadiformis]]''. A [[bivalve shell]] is composed of two hinged valves which are joined by a ligament.")
![[[Tusk shell]] of ''[[Antalis vulgaris]]''.](https://commons.wikimedia.org/wiki/Special:FilePath/Antalis vulgaris.jpg?width=200 "[[Tusk shell]] of ''[[Antalis vulgaris]]''.")
![Four views of a shell of the [[land snail]] ''[[Arianta arbustorum]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Arianta arbustorum - Braunau-1968.jpg?width=200 "Four views of a shell of the [[land snail]] ''[[Arianta arbustorum]]''")
![The marine gastropod ''[[Cypraea chinensis]]'', the Chinese cowry, showing partially extended mantle](https://commons.wikimedia.org/wiki/Special:FilePath/Cypraea chinensis with partially extended mantle.jpg?width=200 "The marine gastropod ''[[Cypraea chinensis]]'', the Chinese cowry, showing partially extended mantle")
![The [[giant clam]] (''Tridacna gigas'') is the largest extant species of bivalve. The mantle is visible between the open valves](https://commons.wikimedia.org/wiki/Special:FilePath/Giant clam or Tridacna gigas.jpg?width=200 "The [[giant clam]] (''Tridacna gigas'') is the largest extant species of bivalve. The mantle is visible between the open valves")
![Mollusc shells in [[Manchester Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/Mollusc Shells.jpg?width=200 "Mollusc shells in [[Manchester Museum]]")
![Precious Wentletrap: the spiral shell of ''[[Epitonium scalare]]'' sea snail.](https://commons.wikimedia.org/wiki/Special:FilePath/Naturalis Biodiversity Center - ZMA.MOLL.347109 - Epitonium scalare.jpg?width=200 "Precious Wentletrap: the spiral shell of ''[[Epitonium scalare]]'' sea snail.")
![''[[Nautilus belauensis]]'' is one of only 6 extant [[cephalopod]] species which have an external shell](https://commons.wikimedia.org/wiki/Special:FilePath/Nautilus profile.jpg?width=200 "''[[Nautilus belauensis]]'' is one of only 6 extant [[cephalopod]] species which have an external shell")
![The chiton ''[[Tonicella lineata]]'', anterior end towards the right](https://commons.wikimedia.org/wiki/Special:FilePath/Tonicella-lineata.jpg?width=200 "The chiton ''[[Tonicella lineata]]'', anterior end towards the right")
EXOSKELETON OF AN ANIMAL IN THE PHYLUM MOLLUSCA
Mollusk shell; Mollusc shells; Shell (mollusc)
The mollusc (or molluskOften spelled mollusk shell in the USA; the spelling "mollusc" are preferred by ) shell is typically a calcareous exoskeleton which encloses, supports and protects the soft parts of an animal in the phylum Mollusca, which includes snails, clams, tusk shells, and several other classes. Not all shelled molluscs live in the sea; many live on the land and in freshwater.
Molluscoidea
![The [[blue-ringed octopus]]'s rings are a warning signal; this octopus is alarmed, and its bite can kill.<ref name="AVRU_BlueRinged" />](https://commons.wikimedia.org/wiki/Special:FilePath/Hapalochlaena lunulata.JPG?width=200 "The [[blue-ringed octopus]]'s rings are a warning signal; this octopus is alarmed, and its bite can kill.<ref name=\"AVRU_BlueRinged\" />")
![The use of [[love dart]]s by the land snail ''[[Monachoides vicinus]]'' is a form of [[sexual selection]]](https://commons.wikimedia.org/wiki/Special:FilePath/Monachoides vicinus dart lateral.jpg?width=200 "The use of [[love dart]]s by the land snail ''[[Monachoides vicinus]]'' is a form of [[sexual selection]]")
.jpg?width=200 "alt=Photo of three circular metal cages in shallows, with docks, boathouses and palm trees in background")
![CDC]])](https://commons.wikimedia.org/wiki/Special:FilePath/Schistosomiasis itch.jpeg?width=200 "CDC]])")
![''[[Cornu aspersum]]'' (formerly ''Helix aspersa'') – a common [[land snail]]](https://commons.wikimedia.org/wiki/Special:FilePath/Snail-wiki-120-Zachi-Evenor.jpg?width=200 "''[[Cornu aspersum]]'' (formerly ''Helix aspersa'') – a common [[land snail]]")
![The tiny [[Helcionellid]] fossil ''[[Yochelcionella]]'' is thought to be an early mollusc<ref name="RunnegarPojeta1974" />](https://commons.wikimedia.org/wiki/Special:FilePath/Yochelcionella water flow.png?width=200 "The tiny [[Helcionellid]] fossil ''[[Yochelcionella]]'' is thought to be an early mollusc<ref name=\"RunnegarPojeta1974\" />")
LARGE PHYLUM OF INVERTEBRATE ANIMALS
Mollusc; Mollusks; Phylum mollusca; Molluscs; Molluscoida; Mollusk venoms; Molluscoidea; Foot (mollusc); Mollusk; Mullusca; Malacofauna; Molluska; Testaria; Reproductive system of mollusks; Archi-mollusc; Hypothetical ancestral mollusc; Hypothetical generalized mollusc; Molluscan; Circulatory systems of mollusks; Sex organs of molluscs; Nervous systems of molluscs
·noun ·pl A division of Invertebrata which includes the classes Brachiopoda and Bryozoa;
- called also Anthoid Mollusca.
mollusca
LARGE PHYLUM OF INVERTEBRATE ANIMALS
Mollusc; Mollusks; Phylum mollusca; Molluscs; Molluscoida; Mollusk venoms; Molluscoidea; Foot (mollusc); Mollusk; Mullusca; Malacofauna; Molluska; Testaria; Reproductive system of mollusks; Archi-mollusc; Hypothetical ancestral mollusc; Hypothetical generalized mollusc; Molluscan; Circulatory systems of mollusks; Sex organs of molluscs; Nervous systems of molluscs
n. pl.
See mollusks.
Википедия
Umbilicus (mollusc)
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and freshwater snails.
The word is also applied to the depressed central area on the planispiral coiled shells of Nautilus species and fossil ammonites. (These are not gastropods, but shelled cephalopods.)
