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443.8- 419.2 MYA
Acanthodian shark
The Suilarian Era was the era in which sharks first began to develop. This era began 450 million years ago. During this period a fish called the Acanthodian was the very first ancestor of the modern shark. Most Spiny sharks measured less than 25 cm. Some of the spiny sharks did not have any teeth so they would have to adapt using a filter-feeding strategy. The Spiny sharks were located in the ocean

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419.2- 358.9 MYA
Leonodus shark
The Early Devonian Era took place about 50 million years after the Suilarian Era. During this period the Leonodus shark had evolved. The Leonodus shark was about 16 inches long with an eel like body. The Leonodus shark also lived in freshwater and had two pronged teeth.

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419.2-358.9 MYA
Cladoselache shark
The Late Devonian Era took place directly after the Early Devonian Era. During this period the Cladoselache shark incarnation first appeared. It had the body shape the resembled more of what a modern shark looked like.  It was 6 feet long with a streamlined body, 5-7 gil slits and dorsal fins.  The Cladoselache shark would have to adapt to having an inflexible jaw. This shark lived in freshwater.

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359-299 MYA
Stethacantus shark
The Carboniferous Era began about 360 million years ago.During this period the Stethacantus shark was located in oceans worldwide. The Stethacantus shark is 3 feet long and weighs about 10-20 pounds. The Stethancantus shark also has an anvil like spiky fin. The Stethancantus shark has a headgear that appears as a brush. The Stethancantus shark adapted to this by scaring away predators with this headgear.

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201.3- 145 MYA
Hexanchiforms shark
The Jurassic Era began around 200 million years ago. During this period the Hexanchiforms shark evolved. The Hexanchiforms shark was located around different oceans worldwide. The Hexanchiformes has 6 to 7 gills and one dorsal fin. The Hexanchiformes has no nictitating membrane which is an extra layer of eye protection. The Hexanchiformes had to adapt to this by being taking extra cautious without the extra eye protection.

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145- 66 MYA
Goblin shark
The Cretaceos period began 145 million years ago. During this period the Goblin sharks were located at different oceans worldwide. The Goblin sharks has a flabby body, a tail, and a shovel like snout. The Goblin shark is sluggish in nature and has to adapt to this by finding ways to trap or limit its prey.

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66 MYA- present day
Megalodon
The Early Cenozoic Era began 60 million years ago. During this period the Megalodon was located in most regions of the ocean. The Megalodon is 65 feet in length and weighs 30 tons. The Megalodon relies on warmer waters and had to try to adapt to a drop in temperature.

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Present day
Hammerhead shark
The Modern Cenozoic Era is the most current era for sharks.  During this period the Hammerhead shark evolved. The Hammerhead shark is located in several different oceans. The Hammerhead shark has a stout body and can reach between 18-20 feet in length.  The hammerhead shark has a hammer shaped head and adapts to this by using it to see 360 degrees.

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I believe that due to the various and extensive environmental issues for sharks such as overfising, human disturbance, and habitat as well as prey loss that sharks will eventually go extinct as a whole. This may take very long to actually happen but this is my hypothesis for the future of sharks.