Fine-structural Observations on Siliceous Scale Production and Shell Assembly in the Testate Amoeba Paulinella chromatophora.

The fine structure of shell formation was observed in P. chromatophora. Scales were formed one by one in silica deposition vesicles (SDVs) that were supported by an array of microtubules, which are probably involved in determining the shape and size of scales. The timing of silicic acid transport into an SDV was shown to be at an early stage of scale… CONTINUE READING