Bjørklund and Swanberg 1987Bjørklund, 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.