Difference between revisions of "umbilicus"
From ZooTerms (Dictionary of Invertebrate Zoology)
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|definition=1. A navel, or navel-like depression | |definition=1. A navel, or navel-like depression | ||
| − | 2. ([[Mollusca]]: Gastropoda) A cavity formed around the shell axis between the faces of the adaxial wall of the whorls where these do not coalesce to form a solid columella. <i>a.</i> In conispiral shells opening at the base of the shell, excepting hyperstrophic type. <i>b.</i> Involute shells may have two umbilici, an upper or adapical and lower or abapical in asymmetrical types, and left and right in isostrophic types. | + | 2. ([[Mollusca]]: [[Gastropoda]]) A [[cavity]] formed around the [[shell]] [[axis]] between the faces of the [[adaxial]] [[wall]] of the whorls where these do not [[coalesce]] to form a solid [[columella]]. <i>a.</i> In [[conispiral]] shells opening at the [[base]] of the [[shell]], excepting [[hyperstrophic]] type. <i>b.</i> Involute shells may have two umbilici, an upper or [[adapical]] and lower or [[abapical]] in [[asymmetrical]] types, and left and right in [[isostrophic]] types. |
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[[Category:Disambiguation page necessary]] | [[Category:Disambiguation page necessary]] | ||
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| + | |scheme=Dictionary of Invertebrate Zoology | ||
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Revision as of 23:42, 13 September 2013
umbilicus (noun; plural -lici; Latin umbilicus, navel): 1. A navel, or navel-like depression2. (Mollusca: Gastropoda) A cavity formed around the shell axis between the faces of the adaxial wall of the whorls where these do not coalesce to form a solid columella. a. In conispiral shells opening at the base of the shell, excepting hyperstrophic type. b. Involute shells may have two umbilici, an upper or adapical and lower or abapical in asymmetrical types, and left and right in isostrophic types.
