Helicoprion
Helicoprion lived about 250 million years ago. It belongs to a group of early sharks whose jaws evolved an elaborate buzz saw-like tooth whorl composed of successively larger replacement teeth, each one fixed to the tooth in front, forming an ever-growing spiral with the earliest (smallest) teeth at its center. This structure may have been used to injure or disable prey, which the shark could then eat at leisure. Helicoprion may have reached lengths over 10 feet, but many of its relatives were smaller and had less impressive tooth spirals.

Echinochimaera
Some 350 million years old, the little chimaeroid-like Echinochimaera (less than 1 foot in length) exhibited the feature common to all members of this bizarre group ? an upper jaw fused to the braincase, often producing a distinctive rabbit-like snout.

Orthacanthus
About 260 million years ago, Orthacanthus was the terror of freshwater swamps and bayous in Europe and North America. Its eel-like body reached nearly 10 feet in length and its powerful jaws were lined with double-fanged teeth. Here it is about to make a meal of a small "horned" amphibian. Orthacanthus belongs to a group of very successful sharks that lived mainly in fresh waters. They first appeared almost 400 million years ago, and became extinct just before the "Age of the Dinosaurs," about 225 million years ago.

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Belantsea
One of the odder looking members of the Chimaera family, Belantsea dates back about 350 million years. Because of its rather ungraceful body and veil-like fins, experts believe that Belantsea was probably a slow swimmer.

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Paleocarcharias
Another shark from the teeming waters of Germany 150 million years ago, Paleocarcharias was a large primitive relative of modern bull sharks and hammerheads.

Cladoselache
One of the best known early sharks, 3-foot-long Cladoselache hunted in the warm seas of North America 375 million years ago. It had a markedly weaker jaw joint than present-day sharks, but it compensated with impressive jaw-closing muscles that are frequently fossilized. Caldoselache had a deep, forked tail and was probably a fast swimmer, which is just as well since it may have been preyed upon by the giant 15-foot armored fish known as Dunkleosteus.

Iniopteryx
A "plump" mid-size chimaera-like fish, Iniopteryx had specialized spines and fins indicative of a bottom-dweller. It lived in North America about 300 million years ago.

Hybodus
Jaws agape, a 6-foot-long Hybodus pursues a swarm of squid-like belemnites 180 million years ago. One of the most common sharks during the "Age of Dinosaurs", Hybodus lived in the sea alongside the ichthyosaurs and plesiosaurs, but it had smaller relatives (some as little as 6 inches long) that lived in streams and rivers.
To the lower left is Palaeospinax which belonged to the lineage that gave rise to all modern sharks and rays. Typically less than 3 feet long, it was one of the first sharks to have solid vertebrae instead of a cartilaginous backbone found in more primitive species of sharks with which it lived.

Stethacanthus
The weird "spine and brush" structure on the back of this 375 million-year-old male Stethacanthus may have served as a sexual signaling device, making it easier for females to pick out potential mates, or was perhaps used in combat by males. Like many early sharks, Stethacanthus was only a few feet long.

Symmorium
Symmorium bears close similarity in size and appearance to Stethacanthus, but is missing the "spine and brush" on its back. Some scientists think that the two forms are simply the males and females of related species, while other scientists think they were different groups.

Protospinax
A shark-like relative of modern rays, the 5-foot-long Protospinax cruised lagoons in southern Germany about 150 million years ago.
On the sea floor is Pseudorhina, an ancient representative of angel sharks. Pseudorhina has an oddly flattened body well adapted for life on the sea floor, and is seen here capturing an ammonite (an extinct creature related to the modern Nautilus).

Carcharodon megalodon
A true seagoing monster, the enormous great white shark Carcharodon megalodon probably reached lengths of 40 feet or more. Six-inch teeth of this behemoth, some the size of daggers, are common fossils in 5-million to 25-million-year-old strata. Its teeth have been found on both sides of North America and in many other parts of the world. Most modern great white sharks are less then half the size of megalodon.

Ischyodus
One of the stranger denizens of the sea covering Germany 150 million years ago, 3-foot-long Ischyodus is a close relative of modern chimaeroids (known also as rabbitfishes, or ghost fishes). This latter name comes from the spectral impression they create as they swim along with their metallic coloration and ribbon-like tail. Instead of separate teeth chimaeroids have massive upper and lower toothplates, which are used to crush prey.

Scapanorhynchus
Scapanorhynchus is an early member of the so-called goblin sharks, a name inspired by their greatly elongated snouts. This 110 million-year-old fossil form has been found on five continents, but closely related modern goblin sharks called Mitsukurina are found only in the deep waters of tropical and temperate seas.

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