Aptychus
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. 2000.

Look at other dictionaries:

  • 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 — 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 — n. [Gr. an, without; ptychos, fold] (MOLLUSCA) A double calcareous plate found in many fossil ammonites, assumed to be an operculum …   Dictionary of invertebrate zoology

  • 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

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”