Definitions

Traskan

List of extraterrestrials in fiction by type

This is a list of extraterrestrial species that have appeared in various works of fiction, sorted by type. Some aliens fit into more than one category, and so appear on the list twice.

Humanoid extraterrestrials

Most aliens are humanoid if not human-like, especially in live action TV series, because the actors are human and only require make-up or masks to appear alien. The Greys described in UFO folklore match this body type. Humanoids include:

 

Near-relatives, ancestors or descendants of mankind

In these stories, these aliens are descended from the same ancestors as humanity. Some are descended directly from humanity:

Feline humanoids

This form has been popular (see Cat-like aliens). They are usually warrior-like as well:

Canine humanoids

Insectoid and arachnid aliens

Centaurs

Reptilians and amphibians

Another popular form. See also Reptilian humanoid.

Aquatic species

Parasites and symbiots

Robotic and mechanical aliens

Aliens that are created through technological means. This category also includes lifeforms that have been altered so that their existence depends on implants and other technologies.

Rodents

Space-living creatures

Sentient plants & fungi

Ancient/Primordial races

Aliens that have either disappeared and left only ruins or developed to godlike, practically omnipotent entities.

More unusual forms

Shape-shifting aliens

Unintelligent creatures

Aliens from other dimensions

Galactic communities

Interstellar governments or communities in which several alien civilizations interact: (see also List of fictional governments).

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References

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