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Giant squid have eight arms but use their two long feeding tentacles to seize prey.
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Giant Squid Anatomy

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A mangrove tree crab clings to a leaf near a Smithsonian marine laboratory in Panama.
Photo

Mangrove Tree Crab

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Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.
Slideshow

Bioluminescent Animals Photo Gallery

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
Article

The Design of a Beautiful Weapon

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
Overview

Giant Squid

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A robotic arm on the Johnson-Sea-Link submersible retrieves Galatheid crabs for research. In the background is a species of the deep-sea coral Lophelia.
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Collecting Deep-Sea Crabs

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Mantis shrimp have built-in polarized vision to help them see underwater—and maybe even communicate.
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Built-in Underwater Polarized Lenses?

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The squidworm has 10 tentacle-like appendages on its head.
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The Squidworm - A New Species

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This small sea star, little more than an inch across, is orange on top and whitish underneath.
Photo

Little Sea Star

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Big Red Deep Sea Jellyfish
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Big Red Jellyfish

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Pacific cephalopods illustrate the wide diversity among this group of mollusks.
Photo

Squids and Cephalopod Diversity

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Image of two white sea shells with spirals.
Audio

Sanibel Island Shells: One Species at a Time

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