Purussaurus was a giant caiman that swam the waterways of South America during the early to late Miocene 20.4 to 5.3 million years ago.

Purussaurus' skull was 145,3 centimeters or 57.2 inches long and had a bite force of around 5.3 metric tons. Unlike many other species of Crocodilians, Purussaurus' snout was noticeably shorter and wider.

There are actually three different species of Purussaurus: Brasiliensis, Neivensis and Mirandia. The first one being the largest of the three, is able to grow around 10.3 meters or 34 feet long. But this isn't fully reliable as the only very well preserved fossils of Purussaurus are their skulls.

Finally it appears that Purussaurus would have been the apex predator of its environment, being able to feed on whatever it wanted. Even the many species of enormous Ground Sloths would have been on the menu for this colossal caiman.

Neivensis

Diet: Small to large creatures.

Casualties: None.

Purussaurus wasn't the only Crocodilian roaming the swamps of South America during the Miocene. Mourasuchus is one such example.

It lived throughout the northern range of South America 15.97 to 7.25 million years ago during the middle to late Miocene period.

Just like Purussaurus, there were multiple different species of Mourasuchus, those species being Amazonensis, Atopus, Arendis and Pattersoni.

Just like the two other species of caimans that are featured in this episode, Mourasuchus was massive, with the largest species being able to grow to be 11 meters or 36 feet long.

Mourasuchus had a long and flat snout that resembled a duck's bill. But what made Mourasuchus stand out even more was that it seemed to have been a filter feeder. This way of feeding would have insured that Mourasuchus didn't have to compete with any of the other species of Crocodilians that it coexisted with it.

Atopus

Diet: Microscopic organisms, pieces of drifting meat and small invertebrates.

Casualties: None.

The last species of Crocodilian that we'll see today is Gryposuchus, and just like the others it inhabited the northern South American swamps of the Miocene 21 to 6.8 million years ago.

Just like the previous two I've discussed, there were different species of Gryposuchus. Those species were known as Jessei, Neogaeus, Colombianus, Croizati and Pachakamue.

Most species of Gryposuchus could grow to be around 10.15 meters or 33.3 feet long, but Neogaeus was by far the largest species, able to grow to 15 meters or 49 feet long.

Unlike the other two Crocodilians we discussed, Gryposuchus was a Gavialodea. This means that it was the closest living relative of the last surviving member of the Gavialoidea, the Gharial. Unfortunately the Gharial is critically endangered and may join Gryposuchus in extinction if we don't do something. Hopefully just like what happened with the Saltwater Crocodiles, we'll be able to save the Gharials from extinction.

Pachakamue

Diet: Fish and possibly terrestrial animals.

Casualties: None.

Anomaly incident: In Venice, Italy during an exceptionally high tide and after a rain storm had left the city more flooded than usual, an anomaly opened and a Mourasuchus swam through it.

As the filter feeding crocodilian swam to the bottom of a canal, a Gryposuchus crossed through the anomaly and started heading towards St. Mark's Square.

Meanwhile the anomaly's signature appeared on the monitors within the ARC facility and soon after an ARC team headed off for Venice.

Upon arrival the ARC team found out that the city's bridges and sidewalks were now almost or completely submerged by the overflow of water.

As the ARC team began to search for the anomaly they discovered that the biggest challenge for them wasn't caused by any creatures threatening them, but rather that they couldn't see where they were stepping.

But as the ARC team waded through the water with some parts reaching up to their waist, a massive Purussaurus swam through the anomaly.

When the ARC team finally arrived at the anomaly's location they were greeted by the Mourasuchus playing with an oar of a nearby gondola.

Seeing the prehistoric crocodilian throwing the oar in the air and then swimming to where it landed gave team leader (****) an idea. She grabbed an oar from the adjacent gondola and threw it into the water.

The Mourasuchus swam towards the oar and threw it into the air, but before it landed in the water, (****) caught it and then tossed it closer to the anomaly with the prehistoric crocodilian heading toward it.

After repeating this cycle a few more times, team leader (****) threw the oar into the anomaly and the Mourasuchus went after it.

Once they had dealt with the Mourasuchus, team leader (****) ordered anomaly researcher (*****) and zoologist (********) to stay with the anomaly while they went looking for any other possible creatures that might have come through the anomaly.

Meanwhile the Gryposuchus arrived at the currently flooded St. Mark's Square and proceeded to enter the Doge's Palace.

When the ARC team arrived in St. Mark's Square they split up to cover more ground, but it wasn't long before the prehistoric gharial found them.

As soon as it exited the establishment and saw the ARC team, the Gryposuchus began to sprint toward the canals.

The ARC team gave chase, but before they could do anything else the massive Purussaurus arrived and was now barring their way.

The giant prehistoric caiman lunged forward at the ARC team. Quickly they leaped away from the crocodilian's enormous jaws.

They shot multiple tranquilizer darts at the Purussauru's body, but they couldn't penetrate the prehistoric caiman's armored back.

Out of options the ARC team began to run into the surrounding buildings, but in the case of paleontologist (******) he was cut off from the rest of the team and was forced to climb up and nearby lamppost.

The giant caiman leaped out of the water as it tried to reach (******), but always just barely missing him.

Finally the Purussaurus jumped out one last time, this time grabbing one of the lamppost's arms. Seeing this paleontologist (******) shot a couple of tranquilizer darts into the Purussauru's soft underbelly. Soon the giant caiman fell asleep.

As the ARC team brought the unconscious Purussaurus back to the anomaly, they found the Gryposuchus swimming alongside them. Once they arrived they were able to get the giant caiman and gharial back through the anomaly with no other indecent.