Outline of life forms
A life form (also spelled life-form or lifeform) is an entity that is living, such as plants (flora), animals (fauna), and fungi (funga). It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, are extinct.Earth is the only celestial body known to harbor life forms. No form of extraterrestrial life has been discovered yet.

Archaea
Archaea – a domain of single-celled microorganisms, morphologically similar to bacteria, but they possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably the enzymes involved in transcription and translation. Many archaea are extremophiles, which means living in harsh environments, such as hot springs and salt lakes, but they have since been found in a broad range of habitats.
Thermoproteota – a phylum of the Archaea kingdom. Initially
Thermoprotei
Sulfolobales – grow in terrestrial volcanic hot springs with optimum growth occurring
Euryarchaeota – In the taxonomy of microorganisms
Haloarchaea
Halobacteriales – in taxonomy, the Halobacteriales are an order of the Halobacteria, found in water saturated or nearly saturated with    salt.
Methanobacteria
Methanobacteriales – information including symptoms, causes, diseases, symptoms, treatments, and other medical and health issues.
Methanococci
Methanococcales aka Methanocaldococcus jannaschii – thermophilic methanogenic archaea, meaning that it thrives at high temperatures and produces methane
Methanomicrobia
Methanosarcinales – In taxonomy, the Methanosarcinales are an order of the Methanomicrobia
Methanopyri
Methanopyrales – In taxonomy, the Methanopyrales are an order of the methanopyri.
Thermococci
Thermococcales
Thermoplasmata
Thermoplasmatales –  An order of aerobic, thermophilic archaea, in the kingdom
Halophiles – organisms that thrive in high salt concentrations
Korarchaeota
Korarchaeum cryptofilum – These archaea have only been found in high temperature hydrothermal environments, particularly hot springs
Lokiarchaeota
Methanogens
Nanoarchaeota
Nanoarchaeum equitans – This organism was discovered in 2002 and lives inside another archaea.
Psychrophiles – (sigh-crow-files)
Nitrososphaerota –  a phylum of the Archaea proposed in 2008 after the genome of Cenarchaeum symbiosum
thermophilic – (a thermophile is an organism)

Bacteria
Bacteria
Gram positive no outer membrane
Actinomycetota (high-G+C)
Bacillota (low-G+C)
Mycoplasmatota (no wall)
Gram negative  outer membrane present
Aquificota
Deinococcota
Fibrobacterota/Chlorobiota/Bacteroidota (FCB group)
Frateuria aurantia (a species of Proteobacteria)
Fusobacteriota
Gemmatimonadota
Nitrospirota
Planctomycetota/Verrucomicrobiota/Chlamydiota (PVC group)
Pseudomonadota/Myxococcota/Bdellovibrionota/Campylobacterota
Spirochaetota
Synergistota
Unknown / ungrouped
Acidobacteriota
Chloroflexota
Chrysiogenota
Cyanobacteria
Deferribacterota
Dictyoglomota
Thermodesulfobacteriota
Thermotogota

Eukaryote
Eukaryote – organisms whose cells contain complex structures enclosed within membranes.
Unikonta
Opisthokonta
Animal – multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development.
Subkingdom Parazoa
Porifera
Placozoa
Subkingdom Eumetazoa
Radiata (unranked)
Ctenophora
Cnidaria
Bilateria (unranked)
Orthonectida
Rhombozoa
Acoelomorpha
Chaetognatha
Superphylum Deuterostomia
Chordata
Hemichordata
Echinodermata
Xenoturbellida
Vetulicolia †
Protostomia (unranked)
Superphylum Ecdysozoa
Kinorhyncha
Loricifera
Priapulida
Nematoda
Nematomorpha
Lobopodia
Onychophora
Tardigrada
Arthropoda
Superphylum Platyzoa
Platyhelminthes
Gastrotricha
Rotifera
Acanthocephala
Gnathostomulida
Micrognathozoa
Cycliophora
Superphylum Lophotrochozoa
Sipuncula
Hyolitha †
Nemertea
Phoronida
Bryozoa
Entoprocta
Brachiopoda
Mollusca
Annelida
Echiura
Mesomycetozoa
Fungi – any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms known as mushrooms.
Blastocladiomycota
Chytridiomycota
Glomeromycota
Microsporidia
Neocallimastigomycota
Dikarya (inc. Deuteromycota)
Ascomycota
Pezizomycotina
Saccharomycotina
Taphrinomycotina
Basidiomycota
Agaricomycotina
Pucciniomycotina
Ustilaginomycotina
Subphyla incertae sedis
Entomophthoromycotina
Kickxellomycotina
Mucoromycotina
Zoopagomycotina
Amoebozoa
Conosa
Mycetozoa (slime-molds)
Archamoebae
Lobosa
Protamoebae
Bikonta
Apusozoa
Excavata
Archaeplastida (plants, broadly defined)
Glaucophyta – glaucophytes
Rhodophyceae – red algae
Chloroplastida
Chlorophyta – green algae (part)
Ulvophyceae
Trebouxiophyceae
Chlorophyceae
Chlorodendrales – green algae (part)
Prasinophytae – green algae (part)
Mesostigma
Charophyta sensu lato – green algae (part) and land plants
Streptophytina – stoneworts and land plants
Charales – stoneworts
Plantae – land plants (embryophytes)
SAR supergroup
Alveolata
Heterokonta
Rhizaria

See also
References
External links
Life (Systema Naturae 2000)
Vitae (BioLib)
Biota (Taxonomicon)
Wikispecies – a free directory of life
MicrobeWiki, extensive wiki about bacteria and viruses