List of life forms

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This article is about a thing that is living or alive. For The Future Sound of London album, see Lifeforms (album). For other uses, see Lifeform (disambiguation).

A life form or lifeform is an entity or being that is living or alive.[1][2] This is a list of articles that relate to physical, hypothetical, alleged, religious, or fictional life forms.

More than 99 percent of all species, amounting to over five billion species,[3] that ever lived on Earth are estimated to be extinct.[4][5] Estimates on the number of Earth's current species range from 10 million to 14 million,[6] of which about 1.2 million have been documented and over 86 percent have not yet been described.[7]

In process philosophy, objects in the world or universe are layered or tiered in complexity.[8] Living things are difficult to define,[9] but life forms can be considered to be the most complex entities in the arena or environment in which they exist.[10] As in process philosophy, this article brings together in a holistic manner, life forms from the diverse human intuitions found in experiences that include the ethical, religious, philosophical, scientific, and aesthetic.[11]

Scientific, evolutionary categories[edit]




Organisms whose cells contain complex structures enclosed within membranes

Scientific, not evolutionary categories[edit]

Hypothetical life[edit]


Artificial and engineered[edit]

Origin of the universe and life[edit]

  • Abiogenesis, the transition from nonliving elements to living systems
  • Cosmogony, any theory concerning the origin of the universe
  • Cosmology, the study of the universe and humanity's place in it
  • Creation myth, a mytho-religious story or explanation that describes the beginnings of humanity, Earth, life, and the universe
  • Genesis creation narrative, creation as described in the first two chapters of the Book of Genesis in the Bible
  • Molecular evolution, evolution at the scale of molecules

Encounters with animate beings subject to skepticism[edit]

Animate beings subject to skepticism[edit]

Folklore, legendary, and mythological[edit]

Religious, spiritual, occult, and philosophical[edit]


See also[edit]

Qualities, attributes, and terms[edit]


See also[edit]


  1. ^ "life form". World English Dictionary. 2009. 
  2. ^ "life form". Online Oxford Dictionary of English. Oxford University Press. 2005. 
  3. ^ Kunin, W.E.; Gaston, Kevin, eds. (31 December 1996). The Biology of Rarity: Causes and consequences of rare—common differences. ISBN 978-0412633805. Retrieved 26 May 2015. 
  4. ^ Stearns, Beverly Peterson; Stearns, S. C.; Stearns, Stephen C. (2000). Watching, from the Edge of Extinction. Yale University Press. p. 1921. ISBN 978-0-300-08469-6. Retrieved 2014-12-27. 
  5. ^ Novacek, Michael J. (8 November 2014). "Prehistory’s Brilliant Future". New York Times. Retrieved 2014-12-25. 
  6. ^ G. Miller; Scott Spoolman (2012). Environmental Science - Biodiversity Is a Crucial Part of the Earth's Natural Capital. Cengage Learning. p. 62. ISBN 1-133-70787-4. Retrieved 2014-12-27. 
  7. ^ Mora, C.; Tittensor, D.P.; Adl, S.; Simpson, A.G.; Worm, B. (23 August 2011). "How many species are there on Earth and in the ocean?". PLOS Biology. doi:10.1371/journal.pbio.1001127. Retrieved 26 May 2015. 
  8. ^ Jeremy R. Hustwit (2007). "Process Philosophy". Internet Encyclopedia of Philosophy. p. 3.d. Rejection of Nominalism. 
  9. ^ Mark A. Bedau (1998). "Four Puzzles about Life". Reed College. 
  10. ^ Harinder S. Sandhu (2010). "Scientific - Origin of the Universe". 
  11. ^ Jeremy R. Hustwit (2007). "Process Philosophy". Internet Encyclopedia of Philosophy. p. 2.a. In Pursuit of a Holistic Worldview.