List of fictional extraterrestrials by form

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This is a List of fictional alien lifeforms from science fiction by physical features or form.

Ancient races[edit]

Aquatic creatures[edit]

Amorphous creatures[edit]

An artist's rendition of a Shoggoth from the Cthulhu Mythos

The amorphous creature is a common trope in science fiction. Usually it is depicted as a living mass of jelly, slime or liquid-like substance that can take any shape it wants.
Amorphous creatures are to be distinguished from shape-shifters that can change their appearance due to their body material to mimic a living or non-living thing however they like.
Metaphorically, "amorphous" refers to any structure, body, figure, text or speech that lacks a distinct form or order.

Energy beings[edit]

See also: Energy being

Extra-dimensional beings[edit]

Gaseous creatures[edit]

Immaterial/Incorporeal beings[edit]

Invertebrates[edit]

Arthropods[edit]

Cephalopods[edit]

Medusozoans[edit]

Worms[edit]

Others[edit]

Living planets[edit]

Microscopic life[edit]

Non-sentient creatures[edit]


Other inorganic life[edit]

See also: § Robotic life
A Horta, a fictional silicon-based life-form in the Star Trek universe.

Space-living creatures[edit]

These fictional creatures purport to thrive in the biome of outer space.

Shapeshifters[edit]

Shape-shifters can change their appearance due to their body material to mimic a living or non-living thing.

Parasites[edit]

Plants and fungi[edit]

Robotic life[edit]

Vertebrates[edit]

Avians[edit]

Humanoids[edit]

Mammalians[edit]

Reptilians and amphibians[edit]

Others[edit]

Others[edit]

References[edit]