About: Protoconch

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An Entity of Type : dbo:Mollusca, within Data Space : dbpedia.org associated with source document(s)
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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. In older texts it is also called "nucleus". The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines. In some gastropod groups (such as the Architectonicidae), the teleoconch whorls spiral in the opposite direction to the protoconch. In those cases, the shell is called heterostrophic.

Attributes	Values
rdf:type	mollusca
rdfs:label	Protoconque (fr) Protoconch (en) Protoconcha (pt)
rdfs:comment	La protoconque, est souvent la coquille larvaire et parfois embryonnaire de certains mollusques. (fr) 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. In older texts it is also called "nucleus". The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines. In some gastropod groups (such as the Architectonicidae), the teleoconch whorls spiral in the opposite direction to the protoconch. In those cases, the shell is called heterostrophic. (en)
foaf:depiction
dcterms:subject	Mollusc shells
Wikipage page ID	5601143 (xsd:integer)
Wikipage revision ID	1046297018 (xsd:integer)
Link from a Wikipage to another Wikipage	Ammonite Prodissoconch Architectonicidae Nudibranch Mollusc shells Mollusc Bivalve Embryo Gastropod Systematics Larva Atlanta lesueurii Homology (biology) Whorl (mollusc) Teleoconch Microscope Sculpture (mollusc) Veliger
sameAs	Protoconch Protoconch Protoconch Protoconch Protoconch Protoconch
dbp:wikiPageUsesTemplate	dbt:Refimprove dbt:Reflist dbt:Short_description dbt:Gastropod_anatomy dbt:Cephalopod_anatomy
thumbnail	wiki-commons:Special:FilePath/Haliotis_asinina_trochophore_protoconch.jpg?width=300
has 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. In older texts it is also called "nucleus". 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 becomes a juvenile, and the protoconch may dissolve. Quite often there is a visible line of demarcation 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 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 a 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. For example, certain nudibranches have an 'inflated' protoconch, which does not grow but houses the growing soft tissues of the larva, and this distinguishes them from other gastropods. The homologous structure in bivalves (clams) is called the prodissoconch. (en) La protoconque, est souvent la coquille larvaire et parfois embryonnaire de certains mollusques. (fr)
gold:hypernym	Shell
prov:wasDerivedFrom	wikipedia-en:Protoconch?oldid=1046297018&ns=0
page length (characters) of wiki page	3348 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Protoconch
is Link from a Wikipage to another Wikipage of	Californiconus Amoria (gastropod) Amoria damonii Amoria spenceriana Bayerotrochus tangaroanus Bayerotrochus teramachii Bayerotrochus westralis Beddomeia fultoni Beddomeia hallae Beddomeia protuberata Bela dyscrita Bela nebula Bela obliquigradata Bela taprurensis Bellaspira melea Belomitra pacifica Belomitra pourtalesii Provanna Pseudorhaphitoma ichthys Roseaplagis artizona Roseaplagis rufozona Scotch bonnet (sea snail) Elaeocyma attalia Endemoconus Menestho exarata Menestho felix Menestho hypocurta Monotigma lauta Monteiroconus Odostomellini Oenopota koreni Pseudodaphnella retellaria Tenaturris janira Trochus camelophorus Turbonilla gibbosa Omphalorissa purchasi Opacuincola gretathunbergae Parthenina Splendrillia granatella Zalipais lissa Splendrillia skambos Turbonilla aculeus Turbonilla doredona Prodissoconch Profundimitra planofilum

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