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<div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Mikadotrochus_hirasei_01.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Mikadotrochus_hirasei_01.jpg/220px-Mikadotrochus_hirasei_01.jpg" decoding="async" width="220" height="131" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Mikadotrochus_hirasei_01.jpg/330px-Mikadotrochus_hirasei_01.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Mikadotrochus_hirasei_01.jpg/440px-Mikadotrochus_hirasei_01.jpg 2x" data-file-width="5280" data-file-height="3144" /></a><figcaption>Four view of the slit shell <i><a href="/wiki/Mikadotrochus_hirasei" title="Mikadotrochus hirasei">Mikadotrochus hirasei</a></i>. The first view shows the selenizone well. The other views show its relationship to the slit in the shell.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Paua3.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Paua3.jpg/220px-Paua3.jpg" decoding="async" width="220" height="112" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Paua3.jpg/330px-Paua3.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Paua3.jpg/440px-Paua3.jpg 2x" data-file-width="1568" data-file-height="800" /></a><figcaption>Three artificially polished shells of a New Zealand <a href="/wiki/Abalone" title="Abalone">abalone</a>, a <i><a href="/wiki/Haliotis" title="Haliotis">Haliotis</a></i> species, probably <i><a href="/wiki/Haliotis_iris" title="Haliotis iris">H. iris</a></i>. The central shell clearly shows the selenizone as a series of holes</figcaption></figure> <p>A <b>selenizone</b> (from the <a href="/wiki/Ancient_Greek" title="Ancient Greek">Greek</a> "selene" meaning "moon", and "zone" meaning "<a href="/wiki/Girdle" title="Girdle">girdle</a>") is an anatomical structure that exists in the <a href="/wiki/Gastropod_shell" title="Gastropod shell">shells</a> of some families of living <a href="/wiki/Sea_snail" title="Sea snail">sea snails</a>: the <a href="/wiki/Slit_shell" class="mw-redirect" title="Slit shell">slit shells</a>, the <a href="/wiki/Little_slit_shells" class="mw-redirect" title="Little slit shells">little slit shells</a> and the <a href="/wiki/Abalone" title="Abalone">abalone</a>, which are <a href="/wiki/Marine_(ocean)" class="mw-redirect" title="Marine (ocean)">marine</a> <a href="/wiki/Gastropod" class="mw-redirect" title="Gastropod">gastropod</a> <a href="/wiki/Mollusk" class="mw-redirect" title="Mollusk">mollusks</a> from ancient <a href="/wiki/Lineage_(evolution)" title="Lineage (evolution)">lineages</a>. </p><p>It is a spiral band of crescentric growth lines or threads (lunulae) on the shell surface due to the semicircular end of a notch or slit on the outer lip.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>A structure of the same type exists in several fossil groups of mollusks, including all the fossil families of slit shells, as well as three superfamilies of what may have been gastropods, but may possibly have been <a href="/wiki/Monoplacophora" title="Monoplacophora">monoplacophorans</a> or <a href="/w/index.php?title=Paragastropods&action=edit&redlink=1" class="new" title="Paragastropods (page does not exist)">paragastropods</a> instead. </p><p>The function of the holes and slits in living sea snails is to allow for <a href="/wiki/Exhalant" class="mw-redirect" title="Exhalant">exhalant</a> water circulation, which is important for <a href="/wiki/Aquatic_respiration" title="Aquatic respiration">respiration</a> and other functions. It has also been suggested that the selenizone may serve to reinforce the shell against catastrophic breakage during predation attempts.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>A new shell-morphological term 'sutsel' has been introduced by Dr. Geiger for the area between the <a href="/wiki/Suture_(anatomy)" title="Suture (anatomy)">SUTure</a> and the SELenizone.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="In_living_gastropods">In living gastropods</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenizone&action=edit&section=1" title="Edit section: In living gastropods"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In the <a href="/wiki/Pleurotomariidae" title="Pleurotomariidae">Pleurotomariidae</a> (the slit shells), and the <a href="/wiki/Scissurellidae" title="Scissurellidae">Scissurellidae</a> (the little slit shells), the selenizone is a groove on the periphery of the shell which forms as the shell grows by the gradual sealing up of a slit that extends back from the edge of the <a href="/wiki/Aperture_(mollusc)" title="Aperture (mollusc)">aperture</a> of the shell. </p><p>In the <a href="/wiki/Haliotidae" class="mw-redirect" title="Haliotidae">Haliotidae</a>, the <a href="/wiki/Abalone" title="Abalone">abalone</a>, the selenizone takes the form of a series of holes in the shell (reaching back from the leading growth edge of the aperture) which form as the shell grows. The older holes are gradually sealed up as the shell grows and new holes form. Each abalone species has a typical number of holes in the selenizone which remain open, and this feature is diagnostic for the individual species. </p> <div class="mw-heading mw-heading2"><h2 id="In_fossil_groups">In fossil groups</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenizone&action=edit&section=2" title="Edit section: In fossil groups"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A selenizone is also present in several superfamilies of fossil mollusks. Not surprisingly it is seen in the numerous fossil gastropod families within the Pleurotomarioidae. The selenizone also exists in the <a href="/wiki/Bellerophontoidea" title="Bellerophontoidea">Bellerophontoidea</a>, which may be gastropods or <a href="/wiki/Monoplacophora" title="Monoplacophora">monoplacophorans</a>; in the <a href="/wiki/Euomphaloidea" title="Euomphaloidea">Euomphaloidea</a>, which are probably gastropods, but may be monoplacophorans; and in the <a href="/wiki/Macluritoidea" title="Macluritoidea">Macluritoidea</a>, which are either <a href="/wiki/Archaeogastropods" class="mw-redirect" title="Archaeogastropods">archaeogastropods</a> or <a href="/w/index.php?title=Paragastropoda&action=edit&redlink=1" class="new" title="Paragastropoda (page does not exist)">Paragastropoda</a> Linsley & Kier, 1984, (paragastropods are a group of mollusks that superficially resemble gastropods, but were <a href="/wiki/Untorted" class="mw-redirect" title="Untorted">untorted</a>).<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Taxa">Taxa</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenizone&action=edit&section=3" title="Edit section: Taxa"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A list of superfamilies and families (both living and fossil) which show this structure, based on the taxonomy of Bouchet <i>et al</i> 2005.<sup id="cite_ref-Bouchet_5-0" class="reference"><a href="#cite_note-Bouchet-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The taxa that are entirely extinct are marked with a dagger † : </p><p><b><a href="/wiki/Extant_taxon" class="mw-redirect" title="Extant taxon">Extant</a> taxa</b>: </p> <ul><li><a href="/wiki/Haliotoidea" title="Haliotoidea">Haliotoidea</a> <ul><li><a href="/wiki/Haliotidae" class="mw-redirect" title="Haliotidae">Haliotidae</a></li></ul></li> <li><a href="/wiki/Pleurotomarioidea" title="Pleurotomarioidea">Pleurotomarioidea</a> <ul><li><a href="/wiki/Pleurotomariidae" title="Pleurotomariidae">Pleurotomariidae</a></li></ul></li> <li><a href="/wiki/Scissurelloidea" title="Scissurelloidea">Scissurelloidea</a> <ul><li><a href="/wiki/Anatomidae" title="Anatomidae">Anatomidae</a></li> <li><a href="/wiki/Scissurellidae" title="Scissurellidae">Scissurellidae</a></li></ul></li></ul> <p><b><a href="/wiki/Fossil" title="Fossil">Fossil</a> taxa</b>: </p><p>Gastropods </p> <ul><li><a href="/wiki/Haliotoidea" title="Haliotoidea">Haliotoidea</a> <ul><li>† <a href="/wiki/Temnotropidae" title="Temnotropidae">Temnotropidae</a></li></ul></li> <li><a href="/wiki/Pleurotomariacea" title="Pleurotomariacea">Pleurotomariacea</a> <ul><li>† Family <a href="/wiki/Catantostomatidae" title="Catantostomatidae">Catantostomatidae</a></li> <li>† Family <a href="/wiki/Kittlidiscidae" title="Kittlidiscidae">Kittlidiscidae</a></li> <li>† Family <a href="/wiki/Phymatopleuridae" title="Phymatopleuridae">Phymatopleuridae</a></li> <li>† Family <a href="/wiki/Polytremariidae" title="Polytremariidae">Polytremariidae</a></li> <li>† Family <a href="/wiki/Portlockiellidae" title="Portlockiellidae">Portlockiellidae</a></li> <li>† Family <a href="/wiki/Rhaphischismatidae" title="Rhaphischismatidae">Rhaphischismatidae</a></li> <li>† Family <a href="/wiki/Trochotomidae" title="Trochotomidae">Trochotomidae</a></li> <li>† Family <a href="/wiki/Zygitidae" title="Zygitidae">Zygitidae</a></li></ul></li></ul> <p>Gastropods or monoplacophorans or paragastropods </p> <ul><li>†<a href="/wiki/Bellerophontoidea" title="Bellerophontoidea">Bellerophontoidea</a> <ul><li>† <a href="/wiki/Bellerophontidae" title="Bellerophontidae">Bellerophontidae</a></li> <li>† <a href="/wiki/Bucanellidae" title="Bucanellidae">Bucanellidae</a></li> <li>† <a href="/wiki/Bucaniidae" title="Bucaniidae">Bucaniidae</a></li> <li>† <a href="/wiki/Euphemitidae" title="Euphemitidae">Euphemitidae</a></li> <li>† <a href="/wiki/Pterothecidae" title="Pterothecidae">Pterothecidae</a></li> <li>† <a href="/wiki/Sinuitidae" title="Sinuitidae">Sinuitidae</a></li> <li>† <a href="/wiki/Tremanotidae" title="Tremanotidae">Tremanotidae</a></li> <li>† <a href="/wiki/Tropidodiscidae" title="Tropidodiscidae">Tropidodiscidae</a></li></ul></li> <li>†<a href="/wiki/Euomphaloidea" title="Euomphaloidea">Euomphaloidea</a> <ul><li>† <a href="/wiki/Euomphalidae" title="Euomphalidae">Euomphalidae</a></li> <li>† <a href="/wiki/Helicotomidae" title="Helicotomidae">Helicotomidae</a></li> <li>† <a href="/wiki/Lesueurillidae" title="Lesueurillidae">Lesueurillidae</a></li> <li>† <a href="/wiki/Omphalocirridae" title="Omphalocirridae">Omphalocirridae</a></li> <li>† <a href="/wiki/Omphalotrochidae" title="Omphalotrochidae">Omphalotrochidae</a></li></ul></li> <li>†<a href="/wiki/Macluritoidea" title="Macluritoidea">Macluritoidea</a> <ul><li>† <a href="/wiki/Macluritidae" title="Macluritidae">Macluritidae</a></li></ul></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenizone&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://en_invertebrate_zoology.en-academic.com/11415/selenizone">"selenizone"</a>. <i>Academic Dictionaries and Encyclopedias</i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Academic+Dictionaries+and+Encyclopedias&rft.atitle=selenizone&rft_id=https%3A%2F%2Fen_invertebrate_zoology.en-academic.com%2F11415%2Fselenizone&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASelenizone" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.app.pan.pl/archive/published/app50/app50-697.pdf">"Repaired injuries and shell form in some Palaeozoicpleurotomarioid gastropods"</a> <span class="cs1-format">(PDF)</span>. <i>www.app.pan.pl</i>. 2005<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-04-06</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.app.pan.pl&rft.atitle=Repaired+injuries+and+shell+form+in+some+Palaeozoicpleurotomarioid+gastropods&rft.date=2005&rft_id=http%3A%2F%2Fwww.app.pan.pl%2Farchive%2Fpublished%2Fapp50%2Fapp50-697.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASelenizone" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Geiger D.L. (2012) <i>Monograph of the little slit shells. Volume 1. Introduction, Scissurellidae. pp. 1-728. Volume 2. Anatomidae, Larocheidae, Depressizonidae, Sutilizonidae, Temnocinclidae</i>. pp. 729-1291. Santa Barbara Museum of Natural History Monographs Number 7.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120908125844/http://www.palaeos.org/Paragastropoda">"Welcome palaeos.org - BlueHost.com"</a>. <i>www.palaeos.org</i>. Archived from <a rel="nofollow" class="external text" href="http://www.palaeos.org/Paragastropoda">the original</a> on 2012-09-08<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-02-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.palaeos.org&rft.atitle=Welcome+palaeos.org+-+BlueHost.com&rft_id=http%3A%2F%2Fwww.palaeos.org%2FParagastropoda&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASelenizone" class="Z3988"></span></span> </li> <li id="cite_note-Bouchet-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-Bouchet_5-0">^</a></b></span> <span class="reference-text">Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. <i>Classification and nomenclator of gastropod families</i>. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/3-925919-72-4" title="Special:BookSources/3-925919-72-4">3-925919-72-4</a>. ISSN 0076-2997. 397 pp. <a rel="nofollow" class="external autonumber" href="http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278">[1]</a></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenizone&action=edit&section=5" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://paleo.cortland.edu/tutorial/Ceph%26Gast/gastropods.htm">Selenizone mentioned here</a></li> <li><a rel="nofollow" class="external text" href="http://www.app.pan.pl/archive/published/app50/app50-697.pdf">Paper on the selenizone and breakage in fossil shells</a></li> <li><a rel="nofollow" class="external text" href="http://www.palaeos.org/Paragastropoda">Information on paragastropods here</a></li></ul> <div class="navbox-styles"><style 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style="width:1%"><a href="/wiki/Gastropod_shell" title="Gastropod shell">Shell</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0;padding: 0.25em 0; line-height: 1.4em;"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aperture_(mollusc)" title="Aperture (mollusc)">Aperture</a></li> <li><a href="/wiki/Apex_(mollusc)" title="Apex (mollusc)">Apex</a></li> <li><a href="/wiki/Body_whorl" title="Body whorl">Body whorl</a></li> <li><a href="/wiki/Callus_(mollusc)" title="Callus (mollusc)">Callus</a></li> <li><a href="/wiki/Columella_(gastropod)" title="Columella (gastropod)">Columella</a></li> <li><a href="/wiki/Lip_(gastropod)" title="Lip (gastropod)">Lip</a></li> <li><a href="/wiki/Lira_(mollusc)" title="Lira (mollusc)">Lira</a></li> <li><a href="/wiki/Nacre" title="Nacre">Nacre</a></li> <li><a href="/wiki/Periostracum" title="Periostracum">Periostracum</a></li> <li><a href="/wiki/Peristome" title="Peristome">Peristome</a></li> <li><a href="/wiki/Planispiral" title="Planispiral">Planispiral</a></li> <li><a href="/wiki/Plait_(gastropod)" title="Plait (gastropod)">Plait</a></li> <li><a href="/wiki/Protoconch" title="Protoconch">Protoconch</a></li> <li><a href="/wiki/Sculpture_(mollusc)" title="Sculpture (mollusc)">Sculpture</a></li> <li><a class="mw-selflink selflink">Selenizone</a></li> <li><a href="/wiki/Siphonal_canal" title="Siphonal canal">Siphonal canal</a></li> <li><a href="/wiki/Siphonal_notch" title="Siphonal notch">Siphonal notch</a></li> <li><a href="/wiki/Spire_(mollusc)" title="Spire (mollusc)">Spire</a></li> <li><a href="/wiki/Stromboid_notch" title="Stromboid notch">Stromboid notch</a></li> <li><a href="/wiki/Suture_(anatomy)" title="Suture (anatomy)">Suture</a></li> <li><a href="/wiki/Umbilicus_(mollusc)" title="Umbilicus (mollusc)">Umbilicus</a></li> <li><a href="/wiki/Valve_(mollusc)" title="Valve (mollusc)">Valve</a></li> <li><a href="/wiki/Varix_(mollusc)" title="Varix (mollusc)">Varix</a></li> <li><a href="/wiki/Whorl_(mollusc)" title="Whorl (mollusc)">Whorl</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other hard parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0;padding: 0.25em 0; line-height: 1.4em;"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clausilium" title="Clausilium">Clausilium</a></li> <li><a href="/wiki/Love_dart" title="Love dart">Love dart</a></li> <li><a href="/wiki/Operculum_(gastropod)" title="Operculum (gastropod)">Operculum</a></li> <li><a href="/wiki/Pearl" title="Pearl">Pearl</a></li> <li><a href="/wiki/Radula" title="Radula">Radula</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">External soft parts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0;padding: 0.25em 0; line-height: 1.4em;"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Caryophyllidia" title="Caryophyllidia">Caryophyllidia</a></li> <li><a href="/wiki/Caudal_mucous_pit" title="Caudal mucous pit">Caudal mucous pit</a></li> <li><a href="/wiki/Cerata" title="Cerata">Cerata</a></li> <li><a href="/wiki/Cnidosac" title="Cnidosac">Cnidosac</a></li> <li><a href="/wiki/Mantle_(mollusc)" title="Mantle (mollusc)">Mantle</a></li> <li><a href="/wiki/Mentum" title="Mentum">Mentum</a></li> <li><a href="/wiki/Notum" title="Notum">Notum</a></li> <li><a href="/wiki/Parapodium" title="Parapodium">Parapodium</a></li> <li><a href="/wiki/Pneumostome" title="Pneumostome">Pneumostome</a></li> <li><a href="/wiki/Rhinophore" title="Rhinophore">Rhinophore</a></li> <li><a href="/wiki/Semper%27s_organ" title="Semper's organ">Semper's organ</a></li> <li><a href="/wiki/Siphon_(mollusc)" title="Siphon (mollusc)">Siphon</a></li> <li><a href="/wiki/Suprapedal_gland" title="Suprapedal gland">Suprapedal gland</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Internal soft parts</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0;padding: 0.25em 0; line-height: 1.4em;"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Circulatory_system_of_gastropods" title="Circulatory system of gastropods">Circulatory system of gastropods</a></li> <li><a href="/wiki/Crop_(anatomy)" title="Crop (anatomy)">Crop</a></li> <li><a href="/wiki/Ctenidium_(mollusc)" title="Ctenidium (mollusc)">Ctenidium</a></li> <li><a href="/wiki/Digestive_system_of_gastropods" title="Digestive system of gastropods">Digestive system of gastropods</a></li> <li><a href="/wiki/Diverticulum_(mollusc)" class="mw-redirect" title="Diverticulum (mollusc)">Diverticula</a></li> <li><a href="/wiki/Excretory_system_of_gastropods" title="Excretory system of gastropods">Excretory system of gastropods</a></li> <li><a href="/wiki/Gastric_shield" title="Gastric shield">Gastric shield</a></li> <li><a href="/wiki/Hancock%27s_organ" title="Hancock's organ">Hancock's organ</a></li> <li><a href="/wiki/Hepatopancreas" title="Hepatopancreas">Hepatopancreas</a></li> <li><a href="/wiki/Hypobranchial_gland" title="Hypobranchial gland">Hypobranchial gland</a></li> <li><a href="/wiki/Nephridium" title="Nephridium">Nephridium</a></li> <li><a href="/wiki/Nervous_system_of_gastropods" title="Nervous system of gastropods">Nervous system of gastropods</a></li> <li><a href="/wiki/Nidamental_gland" title="Nidamental gland">Nidamental gland</a></li> <li><a href="/wiki/Odontophore" title="Odontophore">Odontophore</a></li> <li><a href="/wiki/Oesophageal_pouch" title="Oesophageal pouch">Oesophageal pouch</a></li> <li><a href="/wiki/Osphradium" title="Osphradium">Osphradium</a></li> <li><a href="/wiki/Reproductive_system_of_gastropods" title="Reproductive system of gastropods">Reproductive system of gastropods</a></li> <li><a href="/wiki/Respiratory_system_of_gastropods" title="Respiratory system of gastropods">Respiratory system of gastropods</a></li> <li><a href="/wiki/Sensory_organs_of_gastropods" title="Sensory organs of gastropods">Sensory organs of gastropods</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0;padding: 0.25em 0; line-height: 1.4em;"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Epiphragm" title="Epiphragm">Epiphragm</a></li> <li><a href="/wiki/Pseudofeces" title="Pseudofeces">Pseudofeces</a></li> <li><a href="/wiki/Torsion_(gastropod)" title="Torsion (gastropod)">Torsion</a></li> <li><a href="/wiki/Circumesophageal_nerve_ring" title="Circumesophageal nerve ring">Circumesophageal nerve ring</a></li> <li><a href="/wiki/Trochophore" title="Trochophore">Trochophore</a></li> <li><a href="/wiki/Tyrian_purple" title="Tyrian purple">Tyrian purple</a></li> <li><a href="/wiki/Veliger" title="Veliger">Veliger</a></li></ul> </div></td></tr></tbody></table></div>    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