Examinations of the internal structures of microfossils provide important information about phylogenetic relationships and growth patterns. The internal structure of microfossils was first observed by sectioning during the late nineteenth century (e.g., Schlumberger, 1893, 1896), and further sectioning methods were developed in the twentieth century (e.g., Hemleben et al., 1977; Kennedy, 1978; Coleman, 1979; Nomura, 1983; Suzuki, 1998).

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The internal structure of polycystine radiolarians provided important information on phylogenetic relationships and classification due to the varying internal structures that are characteristic within each family or subfamily (Dumitrica, 1970, 1983, 1985...

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