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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Coronida et Tympanida Diam Fig Zygostephanus dissocircus sp Fig Zygostephanus bicornis sp Fig Zygostephanium dizonium sp Fig Zygostephanium paradictyum sp Fig Acanthodesmia corona sp Fig Plectocoronis pentacantha sp Fig Tristephanium quadricorne sp Fig Tristephanium