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A varix (pl. varices) is an anatomical feature of the shell of certain sea snails, marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda.

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  • Varix (schelpdieren) (nl)
  • Variz (gastrópode) (pt)
  • Varix (mollusc) (en)
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  • Nas conchas dos moluscos gastrópodes a variz é um fenômeno do crescimento de sua espiral e é caracterizada por um espessamento que, em muitos casos, pode conter expansões ou espinhos. * Em uma concha de Murex pecten, as varizes contém longas projeções em forma de espinhos. * Concha de Cassis flammea, com suas oito varizes visíveis, de coloração mais escura. * Concha de Haustellum haustellum, com suas três varizes visíveis, de coloração mais escura. (pt)
  • A varix (pl. varices) is an anatomical feature of the shell of certain sea snails, marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda. (en)
  • Een varix (meervoud varices) is een sculptuurelement bij de buikpotigen (slakken) dat bestaat uit een relatief grove radiaalribbel op het slakkenhuis. Het is een overblijfsel van een oude mondrand. Een varix wordt bij een groeistilstand bij de mondrand aangemaakt en is vaak geprononceerder ontwikkeld dan de gewone radiaire ribben. Bij sommige groepen kan na de aanleg van een varix de groeirichting een hoek maken met de tot dan toe gevolgde richting zoals bij sommige Muricidae. (nl)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Biplex_perca.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Semicassis_Granulata_Apertural.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Chicoreus_palmarosae.jpg
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  • A varix (pl. varices) is an anatomical feature of the shell of certain sea snails, marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda. The varix is a thickened axial ridge, a subcylindrical protrusion, in the shell which exists in some families of marine gastropods. It is an important shell character in generic classification. A varix is located at intervals around the whorl, and is formed by considerable thickening of the outer lip during a resting stage in the growth of the shell. In other words, in gastropods whose shells have varices, the shells are characterised by - the shell grows in spurts, and during the resting phase the varix forms. In many gastropod whose shells have varices, for example the Cassinae, the varix is essentially merely a thickening and swelling of the shell at that point. But in some genera within the family Muricidae, such as Chicoreus, Hexaplex, Pteropurpura and Pterynotus, and also within the genus Biplex, of the family Ranellidae, the varices are characterised by elaborate ruffles, frills or lamellae. Some other genera, for example Murex, are armed with protective spines which may be straight or curved, and which are formed by the varices closing or curling around their axis. (en)
  • Een varix (meervoud varices) is een sculptuurelement bij de buikpotigen (slakken) dat bestaat uit een relatief grove radiaalribbel op het slakkenhuis. Het is een overblijfsel van een oude mondrand. Een varix wordt bij een groeistilstand bij de mondrand aangemaakt en is vaak geprononceerder ontwikkeld dan de gewone radiaire ribben. Bij sommige groepen kan na de aanleg van een varix de groeirichting een hoek maken met de tot dan toe gevolgde richting zoals bij sommige Muricidae. Bittium reticulatum (Muizenkeuteltje) en Nassarius pygmaeus (Kleine fuikhoren) zijn voorbeelden van soorten die dergelijke varices vertonen. (nl)
  • Nas conchas dos moluscos gastrópodes a variz é um fenômeno do crescimento de sua espiral e é caracterizada por um espessamento que, em muitos casos, pode conter expansões ou espinhos. * Em uma concha de Murex pecten, as varizes contém longas projeções em forma de espinhos. * Concha de Cassis flammea, com suas oito varizes visíveis, de coloração mais escura. * Concha de Haustellum haustellum, com suas três varizes visíveis, de coloração mais escura. (pt)
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