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Cystisoma (a type of hyperiid crustacean) has one huge pair of eyes.
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Giant Eyes

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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A diagram of a shark's six highly refined senses: smell, hearing, touch, taste, sight, and electromagnetism
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Shark Senses

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Illustration of the Paleozoic shallow water habitat.
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A Mississippian Marine Habitat (359 - 318 Million Years Ago)

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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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Sea star in a tide pool
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Tide Pools and Adaptations

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Workers in a shed preparing the cast of the blue whale
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A Whale's Head

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Map showing the range of the eastern and western populations of Atlantic bluefin tuna and their spawning grounds in the Gulf of Mexico and the Mediterranean Sea.
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Atlantic Bluefin Tuna Distribution Map

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A female (top left) and male Photerus annecohenae. Note that females are larger than males (sexual dimorphism) and that males have bigger eyes.
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A female and male Photerus annecohenae

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An isopod stands on top of a glass sponge, extending its legs to find zooplankton.
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Isopod in a Glass Home

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A side-view of two skeleton shrimp.
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Skeleton Shrimp

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