In biology, Archezoa is a term that has been introduced by several authors to refer to a group of organisms (a taxon). Authors include Josef Anton Maximilian Perty, [1] Ernst Haeckel [2] and in the 20th century by Thomas Cavalier-Smith in his classification system. Each author used the name to refer to different arrays of organisms.

Archezoa was a kingdom in taxonomy, which is the system that scientists use to put living things in groups. Thomas Cavalier-Smith said taxonomy should have a kingdom called Archezoa, which would contain some living things that have organelles in their cells .

Mar 27, 2025 · Archaea are microorganisms that define the limits of life on Earth. They were originally discovered and described in extreme environments, such as hydrothermal vents and terrestrial hot springs. They were also found in a diverse range of highly saline, acidic, and anaerobic environments.

Archezoa was a kingdom proposed in the 20th century by Thomas Cavalier-Smith (1942–2021), and was believed to encompass eukaryotes which did not have mitochondria (and are therefore amitochondriate) or peroxisomes (e.g. Giardia).

Oct 5, 2015 · This hypothetical ancestral eukaryote is often called archezoan. The attractive feature of these hypotheses stems from the postulated phagotrophic lifestyle of the archezoa: like extant amoeba, the archezoa would routinely engulf bacteria one of which would eventually turn into the endosymbiont [58, 59]. The problem with the archezoan scenarios ...

Jan 30, 2025 · Subkingdom Archezoa Cavalier-Smith 1983 emend. Phylum Metamonada; Phylum Trichozoa; Cavalier-Smith (2002) [edit] From The phagotrophic origin of eukaryotes and phylogenetic classification of Protozoa. In Kingdom Protozoa, Subkingdom Corticata, Infrakingdom Excavata Superphylum Archezoa stat. nov. Phylum Metamonada;

Dec 6, 1998 · The taxon Archezoa was proposed to unite a group of very odd eukaryotes that lack many of the characteristics classically associated with nucleated cells, in particular the mitochondrion.

Archaebacteria fall into three dis tinct groups: Methanobacteria, which get energy by converting carbon dioxide and hydrogen to methane; Halobacteria, which thrive in hypersaline waters; and...

Aug 26, 1997 · For more than two decades, many scientists have believed that mitochondria originated as bacteria that took up residence inside a primitive eukaryotic cell. Some scientists speculated that groups of single-celled organisms, the so-called archezoa, were descendants of those first eukaryotes, which lacked mitochondria.

En Biología, Archezoa es un término que ha sido introducido por varios autores para referirse a un grupo de organismos (un taxón). Los autores incluyen a Josef Anton Maximilian Perty, Ernst Haeckel y en el siglo XX a Thomas Cavalier-Smith en su sistema de clasificación.