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Additional info for 8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume

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Strong differences between specimens from single units probably reflect time-averaging during sedimentation and/or sampling. The previously recognized rhythmic changes of cameral length may have been caused by seasonal variations. Two pathological specimens were episodically incapable of septal secretion and must have survived a phase of negative buoyancy by active swimming. A single non-pathological clymeniid (Rectoclymeniidae n. gen. n. ) with extremely long chambers defies all other specimens but its stream-lined shell form speaks against a benthic, non-buoyant life-style.

It is characterized by partial cleavage without relics of the ancestral spiralian mode, and epibolic gastrulation without flexion of the egg axis (cf. embolic gastrulation). The slow progression of the blastopore lip along the surface of the uncleaved yolk mass is easily grasped by an observer looking at the same embryo day after day until the blastopore is closed. In contrast, the subtle changes occurring subsequently both at the surface and inside the embryo are much more difficult to view (or visualize) in their respective developmental contexts.

P. 6434, CH-1211, Geneva 6, Switzerland Exploring the phylogenetic structure of communities has become a major challenge for ecologists in the last decade. Indeed, the co-occurrence of species into biological communities is not only the result of present processes but also the result of the evolutionary history of those species. Here we investigate in a phylogenetic perspective the mechanisms that have structured extinction patterns among ammonite species. Our study focuses on assemblages from the Early Pliensbachian (Early Jurassic) in western Tethys and adjacent areas.

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