...遗传变差; 物种类源; 分类学; 形态特征;鳍石燕;赵氏弓石燕;中槽壳线程式[gap=1043]Key words: paleontology; animal fossil; spiriferida; brachiopoda; genetical variance; sources of species; taxonomy; morphological characteristics;Finospirifer;Cyrto..
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