what division/phylum of the gymnosperms contains the oldest plant living on earth
A few other, lesser known gymnosperms exist. They don't look anything like conifers, but they are indeed seed plants without flowers, which makes them gymnosperms. The phylum Cycadophyta, or the cycads, is the oldest group of seed plants.Cycads were widespread when dinosaurs roamed the Earth during the Mesozoic.These days, cycads are found mostly in tropical areas and only about 130 species exist.he most famous gymnosperms are in the Phylum Coniferophyta. We usually just call them conifers, which means cone-bearing.. These are the pines, spruces, firs, sequoias and junipers, and this phylum contains more than 600 species.