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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Porodiscida Diam Fig Stephanastrum capitatum sp Fig Pentinastrum asteriscus sp Fig Pentalastrum ophidiaster sp Fig Hexinastrum geryonidum sp Fig Hexalastrum orchidaceum sp Fig Amphibrachium dilatatum sp Fig Amphymenium zygartus sp Fig Amphymenium pupula sp Fig Amphymenium