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Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner Inlet Marine National Park in Australia.
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Seagrass with Epiphytes

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An Australian Giant Cuttlefish (Sepia apama) crosses a seagrass bed.
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Cuttlefish in Seagrass Bed

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Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while medusae spawn eggs and sperm to reproduce sexually.
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Jellyfish Lifecycle and Reproduction

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A beroid ctenophore lunges toward prey with its mouth wide open.
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Mouth Agape Comb Jelly

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A shining jingle shell on the sand.
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Jingle Shells

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The mandarinfish lives in western Pacific tropical coral reef ecosystems and lacks the scales that are typically seen on bony fish.
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Mandarinfish Duo

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Seahorses are hitchhikers. They can travel long distances across the ocean—farther than they can swim—by attaching themselves to floating seaweed and debris.
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Hitchhiking Seahorses

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A bright yellow long-snouted seahorse.
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A Cold-Water Seahorse

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Coral Sand
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Coral Sand Under a Microscope

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Stephanocyathus (A.) spiniger, a solitary, deep-water stony coral species, has six long spines that slow it from sinking into soft substrates.
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Solitary Deep-water Corals

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This day octopus (Octopus cyanea) has shaped itself like seagrass or some coral so hide from predators or stalk prey.
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Camouflaged Octopus Blends In

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A healthy and vibrant coral reef in Papua New Guinea.
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A Healthy Coral Reef

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