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This paper gives an account of the morphologic variation and evolution in a Permian verbeekinoid foraminifer, Lepidolina multiseptata (DEPRAT, 1912), which occurs mainly in East Asia embracing Southea...st Asia, South China and the Japanese Islands. More than 3000 specimens of 34 samples taken carefully from several stratigraphic horizons of the Middle to Upper Permian of this wide geographic area were investigated for the purpose of examining intra- and interpopulational variation and chronologic shift in shell characters. he continuous variation has been analyzed by means of biometric techniques and quantitatively described. Marked individual variation and slight geographic variation are recognized in the species. These phenomena are interpreted from various points of view, such as life cycle, mode of dispersal and habitat environments of the foraminifer. The phyletic evolution with one-way trend shown by this foraminifer is described in detail and briefly discussed. This paper also includes geographic and stratigraphic distribution, paleoecology and taxonomic notes on Lepidolina multiseptata.続きを見る
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1.Introduction 2.Stratigraphic and Geographic Distribution 3.Notes on Paleoecology 4.Material 5.Methods 6.Variation of Morphologic Characters and Their Chronologic Change 7.Discussion 8.Taxonomic Notes 9.Concluding Remarks 10.References Cited
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Mendeley出力
23_02_p117