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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Lithelida Streblonida Phorticida et Soreumida Diam Fig Spirema melonia sp Fig Lithelius solaris sp the first central convolutions only Fig Larcospira quadrangula sp Fig Pylospira octopyle sp Fig Tholospira cervicornis sp Fig Tholospira dendrophora sp Fig Spironium octonium