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An illustration of the anomalocaridid (Aegirocassis benmoulae), a giant filter feeder that fed on plankton and lived in the Early Ordovician about 480 million years ago. The animal measured about 7 feet (2 meters) in length, and is one of the largest arthropods that ever lived.

Prehistoric 'Sea Monster' Had More Legs Than Thought

An illustration of the anomalo-caridid, Aegirocassis benmou-lae, a giant filter feeder that fed on plankton & lived in the Early Ordovician about 480 Ma ago. The animal measured about in length, & is one of the largest arthropods that ever lived

Sphenodus longidens attacking Callorhinchus sp. and Notidanoides muensteri at the bottom

Volgian Jurassic sharks by Olorotitan Sphenodus longidens attack Callorhinchus. Notidanoides on the background.

The Burgess Shale in British Columbia contains very old (~550 million years ago), very rare fossils of very early organisms. This is Haplophrentis. The function of the pair of short spines is unknown but the creature was tiny, just a few centimeters in length (hint 2.5 cm = 1 inch, more or less).

The Burgess Shale in British Columbia contains very old million years ago), very rare fossils of very early organisms. This is Haplophrentis. The function of the pair of short spines is unknown but the creature was tiny, just a few centimeters in le

Cynodont | Cynognathus crateronotus. A large carnivorous cynodont therapsid that ...

Cynognathus million yers ago Period: Early-Mid Triassic (Spathian-Anisian) : South Africa (Karoo region), Lesotho, Argentina, Antarctica, China

Liopleurodon | Toptenz.net

Top 10 Terrifying Prehistoric Sea Monsters

The Pliosaur Liopleurodon surveys the giant fish Leedsichthys while an ammonite…

Dracorex hogwartsia was its  name, which mean the 'Dragon King of Hogwarts', until it was discovered in theory to be early stages of the pachycephalosaurs so it's name isn't legit anymore

Dracorex

Dracorex a pachycephalosaur dinosaur of North America . An artistic impression, a "dragon-like" REAL dinosaur. Remember the word dinosaur was not invented until 1842 by English paleontologist Richard Owen-- before that these animals were called dragons.

Semirostrum ceruttii

Ichthyosaurs of the Lower Lias of England by NTamura on DeviantArt

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