A tiny jellyfish, with tentacles folded and its orange central mass visible through its transparent body, drifts in the waters of Antarcticas Weddell Sea.

A tiny jellyfish, with tentacles folded and its orange central mass visible through its transparent body, drifts in the waters of Antarctica's Weddell Sea.

A pelagic, or open-ocean, octopus gives off a neon glow in Hawaii. Most species of octopus have no internal skeleton, unlike other cephalopods

pelagic octopus off the coast of Hawaii

pelagic octopus off the coast of Hawaii

A photographer’s strobe gives a violet sheen to this translucent juvenile roundbelly cowfish off the coast of Kona, Hawaii. Also known as the transparent boxfish, the roundbelly cowfish has two short horns in front of its eyes.

roundbelly cowfish off the coast of Kona, Hawaii.

roundbelly cowfish off the coast of Kona, Hawaii.

A hydromedusa spreads its luminescent tentacles in the Weddell Sea near Antarctica.

A hydromedusa spreads its luminescent tentacles in the Weddell Sea near Antarctica.

Tiny marine snails known as sea butterflies take many forms, including heart-shaped, such as this species in Antarcticas Weddell Sea.

Tiny marine snails known as sea butterflies take many forms, including heart-shaped, such as this species in Antarctica's Weddell Sea.

Darkness in Antarcticas Weddell Sea gives this comb jelly a chance to show off its candy-colored bioluminescent cells.

Darkness in Antarctica's Weddell Sea gives this comb jelly a chance to show off its candy-colored bioluminescent cells.

The tentacles of a box jellyfish (Chironex fleckeri) trail behind it and can reach 15 feet (4.6 meters) in length. Found in northern Australia and adjacent waters, a sting from this species can be deadly. This species of box jellyfish, the largest, can have as many as 60 tentacles.

The tentacles of a box jellyfish (Chironex fleckeri) trail behind it and can reach 15 feet (4.6 meters) in length. Found in northern Australia and adjacent waters, a sting from this species can be deadly. This species of box jellyfish, the largest, can have as many as 60 tentacles.

Glowing in McMurdo Sound, Antarctica, this transparent jellyfish seems to inhabit another world. From the Arctapodema genus, the transparent jellyfishs grandeur is more remarkable given its inch-long (2.5-centimeter-long) size.

Glowing in McMurdo Sound, Antarctica, this transparent jellyfish seems to inhabit another world. From the Arctapodema genus, the transparent jellyfish's grandeur is more remarkable given its inch-long (2.5-centimeter-long) size.

Advertisements