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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
This condition is also typical for co-existing Naefia as well as for Cenozoic spirulids and unknown in belemnoids (Fuchs & Tanabe 2010). Birkelund, T. 1956. Upper Cretaceous Belemnites from West Greenland. Meddeleser om Gronland, 137 (9), 1- 28. Birkelund, T. and Hansen, H. J. 1974. Shell ultrastructure of some Maastrichtian Ammonoidea and Coleoidea and their taxonomic implications. Det Kongelige Dansk Videnskabernes Selskab. Biologiske Skrifter, 20, 1-34. Fuchs, D. and Tanabe, K. 2010. Re-investigation of shell morphology and ultrastructure in a Late Cretaceous coleoid spirulid Naefia matsumotoi.
There is trends toward a more coiled, smaller ammonitellae and smaller protoconch, although some lineages show an enlargement of the protoconch. The variability and changes in early ontogeny are also investigated over time in some well-dated lineages (Gyroceratites and Erbenoceras-Mimosphinctes lineage). The ontogenetic change of the shape of the aperture is investigated through time and in relation to the amount of whorl overlap and coiling. Major evolutionary trends are an increasingly allometric growth, more thinly discoidal or more globular whorls and narrower umbilici from the earliest ammonoids towards more derived Devonian ammonoids.
Data from a detailed interview questionnaire of Nautilus pompilius fishers and traders in Palawan, Philippines highlight a fishery which is both unsustainable and culturally unimportant. The results show up to 80% declines in catch rates during periods ranging from 1980 to the present. Protection of Nautilus from fishing would provide minimal long term impact on the local culture or economy as there is no cultural relevance to local communities and the fishery only provides approximately 10 - 20 years of economic return before becoming non-viable.
8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume