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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Tholonida Diam Fig Tholartus tricolus sp Fig Tholodes cupula sp Fig Amphitholus artiscus sp Fig Amphitholus panicium sp Fig Amphitholus acanthometra sp Fig Amphitholus acanthometra sp Frontal section of the shell Fig Amphitholonium tricolonium sp Fig Staurotholus tetrastylus