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Along the same lines, the Ginkgo is a species that has no close living relative. It is believed to be most closely related to the giant seed ferns which date back to the Jurassic period.[2] This represents what would also be considered a "lower" land plant. Ginkgo were originally classified in the Taxaceae, or yew, family. When it was discovered that ginkgo had motile sperm, they were moved to their own family, Ginkgoaceae.[2]