Amphibians are up in the Carboniferous, but drop in the Permian. Complete metamorphosis evolves in insects. First amniotes appear and develop mammal-like traits. Pangaea Another huge extinction, the largest so far with loss of lots of marine invertebrates. Pangaea breaks up during the Triassic.
Marine groups hammered in Permian extinction begin to diversify.
Angiosperms maybe arise late in the Triassic, but are certainly on the scene in the early Cretaceous. Insect and angiosperm co-evolution begins, highly specialized insect clades appear. Original amphibian lineages go extinct. One lineage of diapsids will become modern lizards. Another, Archosaura, is a huge and widely diverse group.