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The Invasion of Land. Early vascular plants, collectively known as rhyniophytes, first appeared in the late Early Silurian and diversified considerably through the Late Silurian.rthropods are the most diverse group of animals on Earth and include insects, crustaceans, arachnids, myriapods, and onychophorans as well as extinct forms like trilobites. eurypterid. Any member of an extinct order (Eurypterida) of mostly aquatic, scorpion-like arthropods that were common in the early Paleozoic.
Liverworts may be the closest living relatives to these first vascular land plants, liverworts and the Charophytes being separate branches from green algal ancestors.Green Charophytic algae, as exemplified by Chara at right, show some features of land plants.lants like Cooksonia (as well as Zosterophyllum) had true tracheids in their sporophytes and so are probably more closely related to the ancestors of the vascular land plants. For further details see Gerrienne & Gonez (2011) .