Patterns of ontogenetic septal spacing in Carboniferous ammonoids
Early Carboniferous ammonoids from Oued Temertasset in the Mouydir of Algeria frequently show conspicuous septal crowding at various stages in ontogeny, but particularly immediately at the end of the phragmocone. The analysis of this phenomenon suggests that closer septal spacing is probably not related to maturity in these specimens. Septal crowding occurs in different sizes, and interim septal crowding in juvenile growth stages with subsequent recovery to normal septum distances is common. Four groups of species with different modes of septal crowding can be separated. Close septal spacing is interpreted as a response to adverse ecological conditions such as depletion of oxygen, which caused deceleration of growth at the aperture.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Publication date: 01 October 2008
More about this publication?
- Neues Jahrbuch für Geologie und Paläontologie continuously publishes current original contributions from all fields of geology, ever since its foundation in 1807. All published contributions are in the English language.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Ingenta Connect is not responsible for the content or availability of external websites