The early bony fishes, typified by the sturgeon (bottom), had feeble jaws and long shark-like tails. They dominated the Devonian (the Age of Fishes), to be succeeded in the Triassic (the period when dinosaurs appeared) by fishes like the gar pike (middle) with a shorter more powerful jaw that improved feeding and a shortened more maneuverable tail that improved locomotion. They were in turn succeeded by teleost fishes like the perch (top), with an even better tail for fast, maneuverable swimming and a complex mouth with a mobile upper jaw that slides forward as the mouth opens.
In the chart above, what can you conclude about the order in which new orders and new genera appear?