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Patterns of ontogenetic septal spacing in Carboniferous ammonoids


Kraft, S; Korn, D; Klug, C (2008). Patterns of ontogenetic septal spacing in Carboniferous ammonoids. Neues Jahrbuch für Geologie und Paläontologie, 250(1):31-44.

Abstract

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.

Abstract

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Uncontrolled Keywords:AMMONOIDEA; CARBONIFEROUS; ALGERIA; SEPTAL SPACING; ONTOGENY
Language:English
Date:2008
Deposited On:10 Feb 2009 15:57
Last Modified:05 Apr 2016 12:48
Publisher:Schweizerbart
ISSN:0077-7749
Publisher DOI:https://doi.org/10.1127/0077-7749/2008/0250-0031

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