Three of the phyla of seedless vascular plants-Rhyniophyta, Zosterophyllophyta, and Trimerophytophyta-had become extinct by the end of the Devonian period.

Name: Three of the phyla of seedless vascular plants-Rhyniophyta, Zosterophyllophyta, and Trimerophytophyta-had become extinct by the end of the Devonian period.
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Rhyniophyta, Zosterophyllophyta, and Trimerophytophyta are early groups of vascular plants that became extinct by the end of the Devonian period, which ended around 359 million years ago.

Three of the Phyla of Seedless Vascular Plants-Rhyniophyta, Zosterophyllophyta, and Trimerophytophyta-Had