Gymnospermous vegetation predominates in all terrestrial settings.
Invertebrates Terrestrial Jurassic rocks have yielded a variety of insects flies , mosquitos, caddis flies, earwigs, hymenopterans - ants, bees, and wasps Beetles are known from Cretaceous. In the Jr-K, conical rudists formed reefs . Crustaceans abundant in Jurassic. Anapsids Synapsids Eurapsids Diapsids Terrestrial vertebrate groups bridged the Permian-Triassic extinction event. Recently, paleontologists at the Field Museum of Natural History in Chicago, announced the discovery of what could be the earliest dinosaurs from Madagascar.