Amphibians become more common. 360 to 280 mya Pennsylvanian Period 325 to 280 mya First reptiles. The first mayflies and cockroaches appear. Mississippian Period 360 to 325 mya First winged insects. First tetrapods appear toward the end of the period.
First amphibians appear.
First sharks, bony fish, and ammonoids . Many coral reefs , brachiopods, crinoids . New insects, like springtails, appeared. High seas worldwide. Brachiopods, crinoids , corals .