Euexogiiniarchaia

Euexogiiniarchaia constitute a superkingdom of single-celled organisms. This superkingdom contains **Xenoeuryarchaeota and** Xenoproteoarchaeota. These microorganisms lack cell nuclei and are therefore prokaryotes. Like Archaea on Earth, they were probably the first life on Hume III, and probably arose the same way,

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Exogiiniarchal cells have unique properties separating them from the other two domains, Exogiinavaktiria and Exogiinosefkaryotis. Euexogiiniarchaia are further divided into multiple recognized phyla. Classification is difficult because most have not been isolated in a laboratory and have been detected only by their gene sequences in environmental samples.

Euexogiiniarchaia and Euexogiinavaktiria are generally similar in size and shape, although a few Euexogiiniarchaia have very different shapes, such as the flat and square cells of Xenohaloquadratum xenowalsbyi. On Earth, Despite this morphological similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably for the enzymes involved in transcription and translation. But on Hume III, Exogiiniarchal and  Exogiinavaktiria are as closely related to each other as we thought archaea and bacteria were, unlike Earth, Exogiiniarchal, Exogiinavaktiria, and Exogiinosefkaryotis are all closely related. Other aspects of Euexogiiniarchal biochemistry are unique, such as their reliance on ether lipids in their cell membranes, including archaeols. Euexogiiniarchal use more energy sources than Exogiinosefkaryotis: these range from organic compounds, such as sugars, to ammonia, metal ions or even hydrogen gas. Salt-tolerant Euexogiiniarchal (the Xenohaloarchaea) use sunlight as an energy source, and other species of Euexogiiniarchal fix carbon, but unlike plants and cyanobacteria, no known species of Euexogiiniarchal does both. Euexogiiniarchal reproduce asexually by binary fission, fragmentation, or budding; unlike Euexogiinavaktiria, no known species of Euexogiiniarchal form endospores. The first observed Euexogiiniarchal were extremophiles, living in extreme environments, such as hot springs and salt lakes with no other organisms. Improved molecular detection tools led to the discovery of Euexogiiniarchal in almost every habitat, including soil, oceans, and marshlands. Euexogiiniarchal are particularly numerous in the oceans, and the Euexogiiniarchal in plankton may be one of the most abundant groups of organisms on the planet.

Euexogiiniarchal are a major part of Hume III's life. They are part of the microbiota of all organisms. In The Aununa microbiome, they are important in the gut, mouth, and on the skin. Their morphological, metabolic, and geographical diversity permits them to play multiple ecological roles: carbon fixation; nitrogen cycling; organic compound turnover; and maintaining microbial symbiotic and syntrophic communities, for example.

No clear examples of Euexogiiniarchal pathogens or parasites are known. Instead they are often mutualists or commensals, such as the methanogens (methane-producing strains) that inhabit the gastrointestinal tract in Aununa and a few other aliens on Hume III, where their vast numbers facilitate digestion. Methanogens are also used in biogas production and sewage treatment, and biotechnology exploits enzymes from extremophile Euexogiiniarchal that can endure high temperatures and organic solvents.

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