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- Aptychus abstract "An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved shelly plate, now understood to be part of the body of an ammonite. Paired aptychi have, on rare occasions, been found at or within the aperture of ammonite shells. The aptychus was usually composed of calcite, whereas the ammonite shell was aragonite.Aptychi can be found well-preserved as fossils, but usually quite separate from ammonite shells. This circumstance led to them being initially classified as valves of bivalves (clams), which they do somewhat resemble. Aptychi are found in rocks from the Devonian period through to the those of the Cretaceous period.There are many forms of aptychus, varying in shape and in the sculpture of the inner and outer surfaces. However, because they are so rarely found in position within the ammonite shell, it is often unclear which kind of aptychus belonged to which species of ammonite.When only a single plate is present, as is sometimes the case, the term "anaptychus" is used.".
- Aptychus thumbnail Aptychi_examples_function.PNG?width=300.
- Aptychus wikiPageExternalLink morphological_terminology.htm.
- Aptychus wikiPageID "1841296".
- Aptychus wikiPageLength "4074".
- Aptychus wikiPageOutDegree "22".
- Aptychus wikiPageRevisionID "583354594".
- Aptychus wikiPageWikiLink Ammonite.
- Aptychus wikiPageWikiLink Ammonoidea.
- Aptychus wikiPageWikiLink Aperture_(mollusc).
- Aptychus wikiPageWikiLink Aragonite.
- Aptychus wikiPageWikiLink Bivalve.
- Aptychus wikiPageWikiLink Bivalvia.
- Aptychus wikiPageWikiLink Calcite.
- Aptychus wikiPageWikiLink Category:Cephalopod_zootomy.
- Aptychus wikiPageWikiLink Cephalopod.
- Aptychus wikiPageWikiLink Cephalopod_beak.
- Aptychus wikiPageWikiLink Fossil.
- Aptychus wikiPageWikiLink Laevaptychus.
- Aptychus wikiPageWikiLink Lingulaticeras_solenoides.
- Aptychus wikiPageWikiLink Mirror_image.
- Aptychus wikiPageWikiLink Mollusca.
- Aptychus wikiPageWikiLink Mollusk.
- Aptychus wikiPageWikiLink Nautilus.
- Aptychus wikiPageWikiLink Operculum_(animal).
- Aptychus wikiPageWikiLink Perisphictes.
- Aptychus wikiPageWikiLink Solnhofen_limestone.
- Aptychus wikiPageWikiLink Valve_(mollusc).
- Aptychus wikiPageWikiLink File:Aptychi_examples_function.PNG.
- Aptychus wikiPageWikiLink File:Trigonellites_latus.jpg.
- Aptychus wikiPageWikiLinkText "Aptychi".
- Aptychus wikiPageWikiLinkText "Aptychus".
- Aptychus wikiPageWikiLinkText "aptychi".
- Aptychus wikiPageWikiLinkText "aptychus".
- Aptychus hasPhotoCollection Aptychus.
- Aptychus wikiPageUsesTemplate Template:Cephalopod_anatomy.
- Aptychus wikiPageUsesTemplate Template:Commons_category.
- Aptychus wikiPageUsesTemplate Template:Gallery.
- Aptychus wikiPageUsesTemplate Template:More_footnotes.
- Aptychus wikiPageUsesTemplate Template:Reflist.
- Aptychus subject Category:Cephalopod_zootomy.
- Aptychus hypernym Fossil.
- Aptychus type Animal.
- Aptychus comment "An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved shelly plate, now understood to be part of the body of an ammonite. Paired aptychi have, on rare occasions, been found at or within the aperture of ammonite shells. The aptychus was usually composed of calcite, whereas the ammonite shell was aragonite.Aptychi can be found well-preserved as fossils, but usually quite separate from ammonite shells.".
- Aptychus label "Aptychus".
- Aptychus sameAs Aptychus.
- Aptychus sameAs Aptychus.
- Aptychus sameAs Aptychus.
- Aptychus sameAs m.0604gf.
- Aptychus sameAs Q352138.
- Aptychus sameAs Q352138.
- Aptychus wasDerivedFrom Aptychus?oldid=583354594.
- Aptychus depiction Aptychi_examples_function.PNG.
- Aptychus isPrimaryTopicOf Aptychus.