Translucent Marine Animals

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Sunflower Sea Star

Photograph by Emory Kristof, National Geographic

A sunflower sea star sits nearly unseen on Bowie Seamount, a submerged volcano off the British Columbia coast. These predators can boast three-foot (one-meter) arm spans and use their sucker-laden appendages to snatch up everything from clams to snails and even other sea stars. Though they appear to be sedentary, these animals can use their thousands of tiny feet to move as fast as three feet (one meter) a minute.

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Larval Blenny Fish

Photograph by David Liittschwager, National Geographic

It’s a fish-eat-fish world in the waters of the world’s oceans, and larvae may be the most vulnerable creatures of all. Larvae—the early form of some animals—are small, slow, and largely defenseless compared with their adult relatives. For many species, including this blenny, invisibility is the best bet for survival.

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Hyrdomedusa

Photograph by David Wrobel, Seapics

In the dark waters near the Pacific Ocean seafloor a hydromedusa waves enough tentacles to appear rather like its ancient Greek namesake, Medusa. Medusae, which bud asexually from bottom-dwelling polyps, are just one stage of this jellyfish’s life cycle. Males and females release sperm and eggs, which spawn freely in seawater and form new polyps to begin the cycle again.