Definition of Aptychus. Meaning of Aptychus. Synonyms of Aptychus

- An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved s****y plate, now understood to be part of the body of an ammonite...
- postulated to have been a jaw apparatus. The plates are collectively termed the aptychus or aptychi in the case of a pair of plates, and anaptychus in the case...
- ammonites (extinct s****ed cephalopods), a calcareous structure known as the aptychus (plural aptychi) existed. When these were first described they were thought...
- lacks an aptychus, a biomineralized plate which is proposed to act as an operculum which closes the s**** to protect the body. However, aptychus-like plates...
- scaphopods. The word "sculpture" is also applied to surface features of the aptychus of ammonites, and to the outer surface of some calcareous opercula of marine...
- The Aptychus is a mysterious piece of ammonite anatomy....
- Hectocotylus Tentacles Carpus Dactylus M**** Suckers and hooks Buccal region Aptychus Beak Odontop**** Radula Spadix and antispadix Occipital region Nuchal crest...
- An operculum also covers the eggs of stick insects an other insects. Aptychus: A structure in ammonites which usually consists of two plates, and which...
- Germany and Wealden of Hanover; the limestones and shales of Teschen; the Aptychus and Pygope diphyoides marls of Spain, and the Petchorian formation of Russia...
- s**** is often the only mineralised part of a mollusc (however also see Aptychus and operculum). The s**** are usually preserved as calcium carbonate –...