David Fleetham / Imperial commensal shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer nudibranch (Hexabranchus sanguineus) at night. Philippines.
Chris Newbert / Giant Clam (Tridacna gigas) mantle detail, world's largest and heaviest mollusk, 20 feet deep off of Solomon Islands
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Chris Newbert / Giant Clam (Tridacna gigas) world's largest and heaviest mollusk, 10 feet deep off of Solomon Islands
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Joel Sartore / Photo Ark / Flathead catfish (Pylodictis olivaris) juvenile, portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs. Captive, occurs in North America.
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Joel Sartore / Photo Ark / Flathead catfish (Pylodictis olivaris) juvenile, portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs. Captive, occurs in North America.
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Joel Sartore / Photo Ark / Flathead catfish (Pylodictis olivaris) juvenile, head portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs. Captive, occurs in North America.
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Joel Sartore / Photo Ark / Hornyhead chub (Nocomis biguttatus) head portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs, USA. Captive.
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Joel Sartore / Photo Ark / Hornyhead chub (Nocomis biguttatus) portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs, USA. Captive.
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Joel Sartore / Photo Ark / Hornyhead chub (Nocomis biguttatus) portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs, USA. Captive.
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Joel Sartore / Photo Ark / Hornyhead chub (Nocomis biguttatus) head portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs, USA. Captive.
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Joel Sartore / Photo Ark / Hornyhead chub (Nocomis biguttatus) head portrait, Minnesota Department of Natural Resources Center for Aquatic Mollusk Programs, USA. Captive.