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Bjørklund, K.R. and Swanberg, N.R., 1987. The distribution of two morphotypes of the radiolarian Amphimelissa setosa Cleve (Nassellarida): A result of environmental variability? Sarsia, vol. 72: 245-254. Many thanks to Kjell R. Bjørklund for scanning the original plates. The plates are prepared for web by Jane K. Dolven.
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