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基于居群变异的(蜓)种鉴定——以Eopolydiexodina为例

, PP. 1416-1423

Keywords: 居群,形态种,生物种,Eopolydiexodina,(蜓)类

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Abstract:

?为使类形态种更接近客观真实的生物种,在类化石鉴定中应从居群概念出发,利用居群的形态变异特征约束传统的形态鉴定.根据滇西小新寨剖面中二叠世沙子坡组单层采集的样品,笔者度量了其中Eopolydiexodina个体的特征形态参数(初房直径、内外圈尺寸与轴率),并进一步结合形态统计学方法进行了化石居群层次的形态种鉴定.研究结果表明,该单层中Eopolydiexodina个体的特征形态参数虽表现出较大范围的变异,但形态变异基本连续且满足正态分布.因此,所研究个体的形态变异符合单个居群的形态变异特征,宜根据居群思想视作同一种.本文的研究结果支持了同层产出的同属类个体组成单个化石居群的假设.

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