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A new graptolite species, Monoclimacis praemicropoma , from the Upper Wenlock of Poland is described. It is an ancestor of the Lower Ludlow M. micropoma (Jaeckel). The phytogeny of the praemicropoma-micropoma lineage is discussed. M. micropoma nannopoma (Jaeger) has been assigned to a separate evolutionary lineage. Graptolites, Wenlock, phytogeny . 相似文献
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