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- Protoconch abstract "A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines. The whorls of the adult shell, which are formed after the protoconch, are known as the teleoconch. The teleoconch starts forming when the larval gastropod settles and becomes a juvenile. Quite often there is a visible line of demarkation where the protoconch ends and the teleoconch begins, and there may be a noticeable change in sculpture, or a sudden appearance of sculpture at that point. In some gastropod groups (such as the Architectonicidae), the teleoconch whorls actually spiral in the opposite direction to the protoconch. In those cases the shell is called heterostrophic. In species which have a veliger or swimming larval stage which hatches out of egg capsules, there are two parts to the protoconch. The first part of the protoconch (which is formed within the embryonic egg capsule) is called protoconch 1, while the part that is formed after the larva has hatched is called protoconch 2. There is often different sculpture or ornamentation on protoconch 1 compared with protoconch 2, and this can be distinguished under the microscope. The structure of the protoconch has been widely used as a discriminating feature in gastropod systematics. The homologous structure in bivalves (clams) is called the prodissoconch.".
- Protoconch thumbnail Haliotis_asinina_trochophore_protoconch.jpg?width=300.
- Protoconch wikiPageID "5601143".
- Protoconch wikiPageLength "2523".
- Protoconch wikiPageOutDegree "20".
- Protoconch wikiPageRevisionID "630558959".
- Protoconch wikiPageWikiLink Ammonite.
- Protoconch wikiPageWikiLink Ammonoidea.
- Protoconch wikiPageWikiLink Architectonicidae.
- Protoconch wikiPageWikiLink Atlanta_lesueurii.
- Protoconch wikiPageWikiLink Bivalve.
- Protoconch wikiPageWikiLink Bivalvia.
- Protoconch wikiPageWikiLink Category:Mollusc_shells.
- Protoconch wikiPageWikiLink Embryo.
- Protoconch wikiPageWikiLink Gastropod.
- Protoconch wikiPageWikiLink Gastropod_shell.
- Protoconch wikiPageWikiLink Gastropoda.
- Protoconch wikiPageWikiLink Homology_(biology).
- Protoconch wikiPageWikiLink Larva.
- Protoconch wikiPageWikiLink Microscope.
- Protoconch wikiPageWikiLink Mollusc.
- Protoconch wikiPageWikiLink Mollusca.
- Protoconch wikiPageWikiLink Prodissoconch.
- Protoconch wikiPageWikiLink Systematics.
- Protoconch wikiPageWikiLink Teleoconch.
- Protoconch wikiPageWikiLink Veliger.
- Protoconch wikiPageWikiLink Whorl_(mollusc).
- Protoconch wikiPageWikiLink File:Atlanta_lesueurii.png.
- Protoconch wikiPageWikiLink File:Atlanta_lesueurii_2.png.
- Protoconch wikiPageWikiLink File:Haliotis_asinina_protoconch.jpg.
- Protoconch wikiPageWikiLink File:Haliotis_asinina_trochophore_protoconch.jpg.
- Protoconch wikiPageWikiLinkText "Protoconch".
- Protoconch wikiPageWikiLinkText "embryonic portion".
- Protoconch wikiPageWikiLinkText "embryonic shell".
- Protoconch wikiPageWikiLinkText "embryonic shells".
- Protoconch wikiPageWikiLinkText "embryonic whorls".
- Protoconch wikiPageWikiLinkText "larval shell".
- Protoconch wikiPageWikiLinkText "protoconch".
- Protoconch hasPhotoCollection Protoconch.
- Protoconch wikiPageUsesTemplate Template:Cephalopod_anatomy.
- Protoconch wikiPageUsesTemplate Template:Gastropod_anatomy.
- Protoconch wikiPageUsesTemplate Template:Reflist.
- Protoconch wikiPageUsesTemplate Template:Unreferenced.
- Protoconch subject Category:Mollusc_shells.
- Protoconch hypernym Shell.
- Protoconch type Article.
- Protoconch type Software.
- Protoconch type Article.
- Protoconch comment "A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines. The whorls of the adult shell, which are formed after the protoconch, are known as the teleoconch.".
- Protoconch label "Protoconch".
- Protoconch sameAs m.0dvmnm.
- Protoconch sameAs Q7251951.
- Protoconch sameAs Q7251951.
- Protoconch wasDerivedFrom Protoconch?oldid=630558959.
- Protoconch depiction Haliotis_asinina_trochophore_protoconch.jpg.
- Protoconch isPrimaryTopicOf Protoconch.