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Anomalocaris canadensis was a large marine animal of the Cambrian Period known from fossils in Canada's Burgess Shale and related deposits. It had stalked compound eyes, a circular mouth structure, paired frontal appendages for handling prey, and lateral swimming flaps along its body. Classified amo...
Opabinia regalis was a small marine animal from the middle Cambrian Burgess Shale of British Columbia, Canada. It had five stalked eyes, lateral swimming flaps, and a flexible frontal proboscis ending in a grasping structure that likely moved food toward its ventral mouth. Its unusual anatomy has ma...
Marrella splendens is a small Cambrian arthropod and the most commonly collected animal fossil from the Burgess Shale of British Columbia, Canada. Charles Doolittle Walcott described it in 1912, and its anatomy includes a head shield with paired spines, long antennae, and numerous delicate limbs. It...
Eurypterus remipes was an aquatic arthropod, commonly called a sea scorpion, that lived during the Silurian Period. Fossils are especially abundant in rocks of New York State, where exceptionally preserved specimens reveal its segmented body, broad swimming appendages, and paddle-shaped rear limbs....
Isotelus rex is a very large asaphid trilobite from Late Ordovician rocks in northern Manitoba, Canada. The holotype, catalogued as GSC 118814, is approximately 72 centimetres long and is commonly identified as the largest complete trilobite specimen known. Its exceptional size makes it important fo...
