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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Nassellida Plagonida et Plectanida Diam Fig Cystidium princeps sp Fig Triplagia primordialis sp Fig Tetraplagia phnaxonia sp Fig Plagoniscus tripodiscus sp Fig Plagiocarpa procortina sp Fig Plagonium sphrozoum sp Fig Triplecta triactis sp Fig Tetraplecta pinigera sp