Mosasaurs, plesiosaurs & streakks - Strekanidae
The freshwater streakk - Muraenosaurus leedsi
Close relatives: Prehistoric plesiosaurs, along with mosasaurs and dragons.
The saltwater streakk - Plioplatecarpus draco
Close relatives: The saltwater streakk's closest relatives are the mosasaurs, plesiosaurs, dragons, and more distantly to crocodiles.
No official common name - Eonatator mareserpens
The traditional sea serpent, for years though to be just a sailor's tale. But recent discoveries have revealed that the sea serpent may have really existed, if it doesn't still.
Whales, fish, aquatic mammals, & miscellaneous creatures
The Lake Van monster - Basilosaurus draco
We have found that our first guess at the identity of the Lake Van creature was wrong. At first guess we thought that it was simply a saltwater streakk that escaped into freshwater, however from eyewitness reports have made us conclude that it is most likely a surviving Basilosaurus.
The saddle-back whale - Cadborosaurus willsi
The megalodon - Carcharodon megalodon
The Giglioli's whale - Amphiptera pacifica
The river seal - Acrophoca flumen
The emperor sleath - Halsydrus pontoppidani
The Scottish river otter - Lontra vulpes
The flashlight frog - Micolux subluceo
The lusca - Octopus giganteus
The Atlantic trident seal - Acrophoca triacuspis
The hog-head whale - Maresus maresus