- aptychus
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n. [Gr. an, without; ptychos, fold](MOLLUSCA)A double calcareous plate found in many fossil ammonites, assumed to be an operculum.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
aptychus
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Aptychus — aus Solnhofen, Bildausschnitt 1 cm Der Aptychus ist der schaufelförmige zweiteilige Unterkiefer der Ammoniten, eine ausgestorbenen Gruppe der Kopffüßer. Neben seiner primären Funktion als Unterkiefer ist eine sekundäre Funktion als Operculum… … Deutsch Wikipedia
Aptychus — Ap ty*chus, n. [NL., fr. Gr. a priv. + ?, ?, fold.] (Zo[ o]l.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula. [1913 Webster] || … The Collaborative International Dictionary of English
Aptychus — Un fossile d aptychus (l image mesure 1 cm) Un aptychus désigne soit une écoutille bivalve se refermant sur les coquilles d ammonites disparues soit un morceau de mâchoire de certains céphalopodes modernes. Lorsqu une simple écoutille est… … Wikipédia en Français
Aptychus — An aptychus is either a two valved closing hatch on the shells of extinct ammonites or a jaw piece of some modern cephalopods. When only a single plate is present, the term anaptycus is used.Set against the shell s terminal opening (the living… … Wikipedia
aptychus — noun A marine fossil consisting of a hard anatomical structure like a curved shelly plate, once part of the body of an ammonite. See Also: anaptychus … Wiktionary
aptychus — ap·ty·chus … English syllables
aptychus — … Useful english dictionary
Plagiothecium denticulatum (Hedw.) Schimp. var. aptychus (Spruce) Lees — Symbol PLLA8 Synonym Symbol PLDEA Botanical Family Plagiotheciaceae … Scientific plant list
Plagiothecium denticulatum (Hedw.) Schimp. var. aptychus (Spruce) Lees — Symbol PLLA8 Synonym Symbol PLDEA Botanical Family Plagiotheciaceae … Scientific plant list
Plagiothecium denticulatum (Hedw.) Schimp. var. aptychus (Spruce) Lees — Symbol PLLA8 Synonym Symbol PLDEA Botanical Family Plagiotheciaceae … Scientific plant list
