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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.)

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  • Ombelico (malacologia) (it)
  • Dołek osiowy (pl)
  • Umbílico (pt)
  • Umbilicus (mollusc) (en)
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  • 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.) (en)
  • Umbílico (do latim umbilicus, umbigo; centro) é um espaço tubular vertical ou uma depressão circular localizada dentro da concha de um molusco. O termo é usado frequentemente em descrições de conchas de gastrópodes. É uma característica presente no lado ventral de muitas conchas (mas não todas) de gastrópodes marinhos, terrestres ou de água doce. A palavra também pode ser aplicada para referir-se a uma depressão localizada na área central das conchas de alguns cefalópodes, como os do gênero Nautilus e espécies extintas (fósseis) de amonóides. (pt)
  • Dołek osiowy – zagłębienie w kolumience, wokół której skręcają się zwoje muszli ślimaka. U części ślimaków dołek osiowy nie jest widoczny, gdyż jest zakryty przez wywinięcie wargi (tzw. dołek fałszywy). Część ślimaków ma dołek osiowy otwarty tak szeroko, że widać nawet pierwsze skręty muszli, innym razem jest to jedynie szczelina, zakryta w mniejszym lub większym stopniu. Kształt i obecność dołka osiowego są istotną cechą systematyczną. (pl)
  • In malacologia l'ombelico è una struttura anatomica presente nella parte inferiore centraledella conchiglia di alcuni gasteropodi. L'ombelico è un carattere distintivo importante nel riconoscimento delle varie specie. (it)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/1212amma.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Cittarium_pica_umbilicus.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Helicella_obvia1.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Nautilus_umbilicus-_Allonautilus_scrobiculatus.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Neverita_josephinia_000.jpg
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  • In malacologia l'ombelico è una struttura anatomica presente nella parte inferiore centraledella conchiglia di alcuni gasteropodi. L'ombelico è un carattere distintivo importante nel riconoscimento delle varie specie. L'ombelico si definisce aperto quando è rappresentato da un vero e proprio foro al centro del guscio o chiuso quando la cavità è obliterata da materiale calcareo. Possono esistere forme intermedie. In alcune specie l'ombelico può essere aperto nelle forme giovanili e chiuso negli adulti. Esistono poi anche delle specie non ombelicate, ancorché vi siano comunque rintracciabili deboli indizi della fessura ombelicale. (it)
  • 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.) (en)
  • Umbílico (do latim umbilicus, umbigo; centro) é um espaço tubular vertical ou uma depressão circular localizada dentro da concha de um molusco. O termo é usado frequentemente em descrições de conchas de gastrópodes. É uma característica presente no lado ventral de muitas conchas (mas não todas) de gastrópodes marinhos, terrestres ou de água doce. A palavra também pode ser aplicada para referir-se a uma depressão localizada na área central das conchas de alguns cefalópodes, como os do gênero Nautilus e espécies extintas (fósseis) de amonóides. (pt)
  • Dołek osiowy – zagłębienie w kolumience, wokół której skręcają się zwoje muszli ślimaka. U części ślimaków dołek osiowy nie jest widoczny, gdyż jest zakryty przez wywinięcie wargi (tzw. dołek fałszywy). Część ślimaków ma dołek osiowy otwarty tak szeroko, że widać nawet pierwsze skręty muszli, innym razem jest to jedynie szczelina, zakryta w mniejszym lub większym stopniu. Kształt i obecność dołka osiowego są istotną cechą systematyczną. (pl)
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