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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Zygospyrida Tholospyrida Phormospyrida et Androspyrida Diam Fig Tripospyris cortina sp Basal view Fig Tripospyris triplecta sp Basal view Fig Tripospyris semantrum sp Basal view Fig Tripospyris hexomma sp Basal view Fig Brachiospyris diacantha sp Basal view Fig Tetraspyris