The seas and oceans are home to some of the most bizarre-looking creatures living on Earth. The following are 10 ocean dwellers that look as if they are from out of this world.

Roboastra gracilis

A tiny sea slug, reaching only 2-2.5 centimeters (0.78-0.98 inches) in length, can be found in the tropical western Pacific Ocean.

Sea pen

These feather-looking colonial invertebrate marine animals live in shallow and deep waters from polar seas to the tropics.

Glaucus atlanticus

Known as the blue sea dragon, this creature that rarely grows beyond 3 cm was recorded to have appeared in the Atlantic, Indian and Pacific oceans.

Tasselled wobbegong

This fish is a species of carpet shark that inhabits shallow coral reefs off northern Australia, New Guinea and nearby islands.

Clown frogfish

This creature can change its color depending on the environment and lives in the tropical waters of the Indo-Pacific area.

Fried egg jellyfish

This accurately named cool-water species is quite large for a jellyfish as it can grow up to 60 cm in diameter and tentacles as long as 6 meters (19.7 feet). Though population is not very large it can be found in many parts of the world's oceans.

Leafy seadragon

The seadragon, proficient in camouflage, lives along the southern and western coasts of Australia.

Halimeda ghost pipefish

This uncommon species that lives in the Indian Ocean and in the Western Indo-Pacific is related to pipefishes and seahorses.

Christmas tree worms

Spirobranchus giganteus is a tube-building polychaete worm that has been spotted from the Caribbean to the Indo-Pacific.

Red-lipped batfish

This fish of unusual morphology is found around the Galapagos Islands and off Peru