1979•Biodiversity Heritage Library (Smithsonian Institution)Open access
The jaws and radula of the Jurassic ammonite Dactylioceras
Ulrich Lehmann
Open full text 32 citations
Abstract
Anaptychi ( = lower jaws) and upper jaws of two specimens of Dactylioceras from the Yorkshire coast, found within their living chambers, are described and analysed.The corresponding lower and upper jaws are about equal in length and much shorter than the height of the living chambers.One of the ammonites contained numerous radular teeth between the lower and upper jaw.In addition, isolated lower and upper jaws attributed to Dactylioceras are reported from Reichenschwand (near Niirnberg, Federal Republic of Germany).When investigating specimens of Dactylioceras from the Yorkshire coast, several anaptychi were discovered within their living chambers.Two of them were sawed Lehmann, Ulrich.1979."The jaws and radula of the Jurassic ammonite Dactylioceras."
Open-access reader