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*Hirokazu Yukawa
Graduate school of natural science and technology, Okayama University, Okayama 700-8530, Japan
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Ge Sun
Paleontological Museum of Liaoning, Shenyang 110034, China College of paleontology, Shenyang Normal University, Shenyang 110034, China
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Sigeyuki Suzuki
Department of earth sciences, Okayama University