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List of fictional extraterrestrials by form

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

Contents

Ancient racesEdit

Aquatic creaturesEdit

Amorphous creaturesEdit

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. In Japan most amorphous creatures (especially those made of liquids) are called Slimes.

Energy beingsEdit

Extra-dimensional beingsEdit

Gaseous creaturesEdit

Immaterial/Incorporeal beingsEdit

InvertebratesEdit

ArthropodsEdit

CephalopodsEdit

MedusozoansEdit

WormsEdit

OthersEdit

Living planetsEdit

Microscopic lifeEdit

Non-sentient creaturesEdit

Other inorganic lifeEdit

Space-living creaturesEdit

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

ShapeshiftersEdit

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

ParasitesEdit

Plants and fungiEdit

Robotic lifeEdit

VertebratesEdit

AviansEdit

HumanoidsEdit

MammaliansEdit

Reptilians and amphibiansEdit

OthersEdit

See alsoEdit

NotesEdit

  1. ^ The physical features and form might be entirely fictional or based on hypotheses from exobiology