The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a . Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture.
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| - Aperture (mollusc) (en)
- Apertura (mollusken) (nl)
- 殼口 (zh)
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| - De apertura (enkelvoud) of mondopening is de opening in de schelp van bepaalde weekdieren waardoor het lichaam van het dier gedeeltelijk naar buiten kan komen voor de voortbeweging, voeding, etc. De term is in gebruik bij de slakken, bij inktvissen met een uitwendige schelp zoals nautilussen en de ammonieten en bij de stoottanden. De schelp van de stoottanden is buisvormig en heeft daardoor ook twee openingen die de anterieure en de posterieure apertura worden genoemd. Van deze is de posterieure apertura de kleinste. Bij alle andere weekdiergroepen, waaronder de keverslakken en de tweekleppigen is er geen apertura. (nl)
- 殼口（英語：aperture）是指腹足綱、掘足纲、鹦鹉螺科及菊石等有殼類軟體動物的殼上的主要開口，可讓貝類的頭足部分從這個開口伸出來，以便於移動及進食之餘，受襲時又可退回螺殼內。這個開口隨物種的不同而有不同的形狀，例如：圓形、卵形，甚或只餘下一條被稱為「中央溝」的開口。 双壳纲物種的開口並不會叫作「殼口」：牠們的開口有另一個名稱「」，平常處於關閉狀態。 此外，由於掘足綱物種的殼是圓筒形，所以牠們有兩個殼口：較大的前殼口是主殼口，而較小的是後殼口。 (zh)
- The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a . Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. (en)
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| - The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells. The word is not used to describe bivalve shells, where a natural opening between the two shell valves in the closed position is usually called a . Scaphopod shells are tubular, and thus they have two openings: a main anterior aperture and a smaller posterior aperture. As well as the aperture, some gastropod shells have additional openings in their shells for respiration; this is the case in some Fissurellidae (keyhole limpets) where the central smaller opening at the apex of the shell is called an orifice, and in the Haliotidae (abalones) where the row of respiratory openings in the shell are also called orifices. (en)
- De apertura (enkelvoud) of mondopening is de opening in de schelp van bepaalde weekdieren waardoor het lichaam van het dier gedeeltelijk naar buiten kan komen voor de voortbeweging, voeding, etc. De term is in gebruik bij de slakken, bij inktvissen met een uitwendige schelp zoals nautilussen en de ammonieten en bij de stoottanden. De schelp van de stoottanden is buisvormig en heeft daardoor ook twee openingen die de anterieure en de posterieure apertura worden genoemd. Van deze is de posterieure apertura de kleinste. Bij alle andere weekdiergroepen, waaronder de keverslakken en de tweekleppigen is er geen apertura. (nl)
- 殼口（英語：aperture）是指腹足綱、掘足纲、鹦鹉螺科及菊石等有殼類軟體動物的殼上的主要開口，可讓貝類的頭足部分從這個開口伸出來，以便於移動及進食之餘，受襲時又可退回螺殼內。這個開口隨物種的不同而有不同的形狀，例如：圓形、卵形，甚或只餘下一條被稱為「中央溝」的開口。 双壳纲物種的開口並不會叫作「殼口」：牠們的開口有另一個名稱「」，平常處於關閉狀態。 此外，由於掘足綱物種的殼是圓筒形，所以牠們有兩個殼口：較大的前殼口是主殼口，而較小的是後殼口。 (zh)
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