Floatation Mechanisms in Modern and Fossil Cephalopods

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This chapter discusses the floatation mechanisms in modern and fossil cephalopods. The buoyancy of an aquatic animal is measured by weighing it in air and in the sea water in which it lives. If it has zero weight in such water, it is called as “neutrally buoyant.” In air, the weight can be measured directly on a balance, while in the sea water, the weight that must be added to bring the animal to neutral buoyancy can be found. The chapter distinguishes between these two conditions by referring to the sinking animal as having a positive weight and the floating animal as having a negative weight in sea water. It compares the buoyancy of different animals by expressing their weights in sea water as percentages of their weights in air. It also discusses the buoyancy given by fats, tissue fluids, and gas spaces. The chapter discusses the evolution of the cephalopods with chambered shells and summarizes the evolutionary relationships of fossil and modern cephalopods.

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