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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

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Artistic rendering of an ancient shark, Helicoprion.
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Illustration of Helicoprion

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dugong feeds on seagrass in the Red Sea
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Dugong Feeding

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The first known filter feeder is a large shrimp-like creature called Tamisiocaris borealis. The feather-like structures on its head were used to rake plankton from the sea.
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The First Filter Feeder

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An illustration of multispecies communities of dugongs from India, Mexico and Florida
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Multispecies Communities of Seacows

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An illustration of multispecies communities of dugongs from India, Mexico and Florida
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The Discovery of Multispecies Communities of Seacows

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A skeleton of an ichthyosaur
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An Ichthyosaur's Bones

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A fossil imprint of Haplophrentis carinatus with two oar-like appendages.
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Haplophrentis carinatus

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a fossilized jawbone and tooth of an ichthyosaur
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An Ichthyosaur Jaw Bone

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Color illustration of an ancient bivalve.
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Elevator Rudists

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Offshore Peru, during the Eocene (~56-34 million years ago), showing two archaeocetes (ancient whales): Ocucajea picklingi and Supayacetus muizon.
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Eocene Whales and Penguins Off the Coast of Peru

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ichthyosaurs frolic in the waves
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Form Equals Function for Ancient Sea Lizards and Modern Whales

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