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Extra resources for 8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume
Wells (1978) postulated that the octopuses did not possess the feedback mechanisms required for mastering such tasks. Using an operant behavioral task we now show that Octopus vulgaris is capable of visually guiding a complex arm movement to a specific location. We developed a transparent Plexiglas 3 choice maze, building on the natural exploration movements of the octopus arm, to investigate the relationship between vision and the control of complex arm movement. Following a random sequence, in each trial only 1 of the 3 compartments contained a visual stimulus and a reward.
Straight phragmocones with moderate apical angle (18-32°) and proostracum width about 28-33% of camera width, suture usually with rounded dorsal saddle; rostrum short, belemnitelike (genera Diplobelus, Quiricobelus, Pavloviteuthis, Tauriconites and possibly some more). There are no clear apomorphies and no obvious stratigraphic trends for this group, so this group needs to be restudied. Next step of investigation was comparative microstructural study of rostra for both groups. Chalalabelus has shown that its rostra consist of pure aragonite and have specific microstructure, closely resembling such of Kostromateuthis and spirulids – from one side, and of Triassic Belemnococeras – from the second side.
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. 195-207. , Sasaki, K. and Hirano, H. (eds). Cephalopods - Present & Past.
8th International Symposium Cephalopods – Present and Past, August 30 – September 3, 2010, University of Burgundy & CNRS, Dijon – France. Abstracts Volume