|
Diaspora (protozoa)
''Diaspora'' is a genus in the phylum Apicomplexa, first described by Leger in 1898.Leger L (1898) Essai sur la classification des coccidies et description de quelques especes nouvelles ou peu connues. Annales du Musee d'Histoire Naturelle de Marseille, Serie II, Bulletin Notes Zoologiques, Geologiques, Paleontologiques Variétés 1: 71-123 Taxonomy There is one species in this genus - '' Diaspora hydatidea''. This species was isolated from a millipede ('' Polydesmus'' species) This genus was created for those Eimeriidae whose oocysts are unknown but have sporocysts each containing a single sporozoite Apicomplexans, a group of intracellular parasites, have life cycle stages that allow them to survive the wide variety of environments they are exposed to during their complex life cycle. Each stage in the life cycle of an apicomplexan organism i .... As such it is poorly defined and may be revised in the future. References Apicomplexa genera {{Apicomplexa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eukaryota
Eukaryotes () are organisms whose Cell (biology), cells have a cell nucleus, nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the Three-domain system, three domains of life. Bacteria and Archaea (both prokaryotes) make up the other two domains. The eukaryotes are usually now regarded as having emerged in the Archaea or as a sister of the Asgard (archaea), Asgard archaea. This implies that there are only Two-domain system, two domains of life, Bacteria and Archaea, with eukaryotes incorporated among archaea. Eukaryotes represent a small minority of the number of organisms, but, due to their generally much larger size, their collective global biomass (ecology), biomass is estimated to be about equal to that of prokaryotes. Eukaryotes emerged approximately 2.3–1.8 billion years ago, during the Proterozoic eon, likely as Flagellated cell, flagellated phagotrophs. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAR Supergroup
The SAR supergroup, also just SAR or Harosa, is a clade that includes stramenopiles (heterokonts), alveolates, and Rhizaria. The name is an acronym derived from the first letters of each of these clades; it has been alternatively spelled "RAS". The term "Harosa" (at the subkingdom level) has also been used. The SAR supergroup is a node-based taxon. Note that as a formal taxon, "Sar" has only its first letter capitalized, while the earlier abbreviation, SAR, retains all uppercase letters. Both names refer to the same group of organisms, unless further taxonomic revisions deem otherwise. Members of the SAR supergroup were once included under the separate supergroups Chromalveolata (Chromista and Alveolata) and Rhizaria, until phylogenetic studies confirmed that stramenopiles and alveolates diverged with Rhizaria. This apparently excluded haptophytes and cryptomonads, leading Okamoto ''et al.'' (2009) to propose the clade Hacrobia to accommodate them. Phylogeny Based on a compi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apicomplexa
The Apicomplexa (also called Apicomplexia) are a large phylum of parasitic alveolates. Most of them possess a unique form of organelle that comprises a type of non-photosynthetic plastid called an apicoplast, and an apical complex structure. The organelle is an adaptation that the apicomplexan applies in penetration of a host cell. The Apicomplexa are unicellular and spore-forming. All species are obligate endoparasites of animals, except '' Nephromyces'', a symbiont in marine animals, originally classified as a chytrid fungus. Motile structures such as flagella or pseudopods are present only in certain gamete stages. The Apicomplexa are a diverse group that includes organisms such as the coccidia, gregarines, piroplasms, haemogregarines, and plasmodia. Diseases caused by Apicomplexa include: * Babesiosis (''Babesia'') * Malaria (''Plasmodium'') * Cryptosporidiosis (''Cryptosporidium parvum'') * Cyclosporiasis (''Cyclospora cayetanensis'') * Cystoisosporiasis (''Cystoisosp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conoidasida
Conoidasida is a class of parasitic alveolates in the phylum Apicomplexa. The class was defined in 1988 by Levine and contains two subclasses – the coccidia and the gregarines. All members of this class have a complete, hollow, truncated conoid. Gregarines tend to parasitize invertebrates with the mature gamonts being extracellular, the coccidia mostly infect vertebrates and have intracellular gamonts. Description A conoid is found in most species and when present forms complete but truncated cone. Sexual and asexual reproduction are present in life cycle of all species. Each zygote normally forms an oocyst wall within which it undergoes meiosis. This is sometimes followed by mitosis. This process of sporogony produces mobile vermiform infectious sporozoites. Multiple mitotic divisions ( schizogony) also occur during merogony of the feeding stages (trophozoites) and during gametogony. Motility Microgametes of some species are flagellated. Locomotion of other gametes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coccidia
Coccidia (Coccidiasina) are a subclass of microscopic, spore-forming, single-celled obligate intracellular parasites belonging to the apicomplexan class Conoidasida. As obligate intracellular parasites, they must live and reproduce within an animal cell. Coccidian parasites infect the intestinal tracts of animals, and are the largest group of apicomplexan protozoa. Infection with these parasites is known as coccidiosis. Coccidia can infect all mammals, some birds, some fish, some reptiles, and some amphibians. Most species of coccidia are species-specific in their host. An exception is ''Toxoplasma gondii'', which can infect all mammals, although it can only undergo sexual reproduction in cats. Depending on the species of coccidia, infection can cause fever, vomiting, diarrhea, muscle pain, and nervous system effects and changes to behavior, and may lead to death. Healthy adults may recover without medication—but those who are immunocompromised or young almost certainly requi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eucoccidiorida
The Eucoccidiorida are an order of microscopic, spore-forming, single-celled parasites belonging to the apicomplexan class Conoidasida. Protozoans of this order include parasites of humans, and both domesticated and wild animals including birds. Among these parasites are the ''Toxoplasma gondii'' that cause toxoplasmosis and ''Isospora belli'', which results in isosporiasis. Definition This is the largest order in the class Conoidasida and contains those species that all undergo merogony (asexual), gametogony (sexual) and sporogony (spore formation) during their lifecycles. Genera Nineteen families, three subfamilies, and 70 genera are recognised in this order. The genera include: '' Adelea'', '' Adelina'', ''Aggregata'', '' Alveocystis'', ''Atoxoplasma'', ''Babesiosoma'', '' Barrouxia'', '' Bartazoon'', '' Besnoitia'', ''Calyptospora'', '' Caryospora'', '' Caryotropha'', '' Chagasella'', ''Choleoeimeria'', ''Cryptosporidium'', '' Crystallospora'', ''Cyclospora'', '' Cyrilia'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eimeriorina
Eimeriorina is a suborder of phylum Apicomplexa. All species in this clade are homoxenous or facultatively homoxenous. Merogony, gamogony and oocyst formation all occur within the same host. The hosts may be vertebrates or invertebrates. Erroneous identifications of species is a major problem in coccidian systematics and it is likely that some of the genera and species will be revised. Taxonomy There are 12 families, 2 subfamilies and 50 genera recognised in this suborder. The genus ''Eimeria'' with ~1500 species is the largest genus in this suborder. Notes One genus is entirely entomoxenous (parasitic on insects) — '' Barrouxia''. The taxonomic status of ''Atoxoplasma ''Atoxoplasma'' is a genus of parasitic alveolates in the phylum Apicomplexa. The species in this genus infect birds. They are spread by the orofaecal route. History This genus was created by Garnham in 1950. The history of this genus has been ...'' remains unclear. References Conoidasida SAR ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eimeriidae
Eimeriidae is a family of Apicomplexa. It contains the following genera: *'' Acroeimeria'' Paperna & Landsberg, 1989 *'' Alveocystis'' Bel'tenev, 1980 *'' Caryospora'' Léger, 1904 *'' Cyclospora'' Schneider, 1881 *'' Diaspora'' Léger, 1898 *''Dorisa'' Levine, 1979 *''Eimeria'' Schneider, 1875 *''Epieimeria'' Dyková & Lom, 1981 *''Gousseffia'' Levine & Ivens, 1979 *'' Hoarella'' Arcay de Peraza, 1963 *''Isospora'' Schneider, 1881 *'' Mantonella'' Vincent, 1936 *'' Octosporella'' Ray & Ragavachari, 1942 *'' Pfeifferinella'' von Wasielewski, 1904 *'' Polysporella'' McQuistion, 1990 *'' Pythonella'' Ray & Das Gupta, 1937 *'' Sivatoshella'' Ray & Sarkar, 1968 Taxonomy The family ''Goussia'' forms a trichotomy with the ''Eimeriidae'' and ''Sarcocystidae The Sarcocystidae are a family of Apicomplexa associated with a variety of diseases in humans and other animals. Taxonomy Genera in this family include: * ''Besnoitia'' * '' Cystoisospora'' * '' Frenkelia'' * '' Nephroisospora' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaspora Hydatidea
A diaspora ( ) is a population that is scattered across regions which are separate from its geographic place of origin. Historically, the word was used first in reference to the dispersion of Greeks in the Hellenic world, and later Jews after the Babylonian exile. The word "diaspora" is used today in reference to people who identify with a specific geographic location, but currently reside elsewhere. Examples of notably large diasporic populations are the Assyrian–Chaldean–Syriac diaspora, which originated during and after the early Arab-Muslim conquests and continued to grow in the aftermath of the Assyrian genocide; the southern Chinese and Indians who left their homelands during the 19th and 20th centuries; the Irish diaspora that came into existence both during and after the Great Famine; the Scottish diaspora that developed on a large scale after the Highland Clearances and Lowland Clearances; the nomadic Romani population from the Indian subcontinent; the Italian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polydesmus
''Polydesmus'' is a genus of millipedes in the family Polydesmidae. Species Species within this genus include: * '' Polydesmus abchasius'' * '' Polydesmus abstrusus'' * '' Polydesmus aegyptiacus'' * '' Polydesmus alatus'' * '' Polydesmus albocarinatus'' * '' Polydesmus almassyi'' * '' Polydesmus alternatus'' * ''Polydesmus alutaceus'' * ''Polydesmus angustus'' * '' Polydesmus annectens'' * ''Polydesmus arcticollis'' * '' Polydesmus areatus'' * '' Polydesmus armatus'' * '' Polydesmus astenestatus'' * ''Polydesmus asthenestatus'' * ''Polydesmus ater'' * ''Polydesmus barberii'' * ''Polydesmus bataviae'' * ''Polydesmus beaumontii'' * ''Polydesmus beroni'' * ''Polydesmus bogotensis'' * ''Polydesmus bonikus'' * ''Polydesmus brachydesmoides'' * ''Polydesmus brevimanus'' * '' Polydesmus bureschi'' * '' Polydesmus caesius'' * '' Polydesmus callipus'' * '' Polydesmus capensis'' * ''Polydesmus carneus'' * '' Polydesmus cavernarum'' * ''Polydesmus cerrrutti'' * ''Polydesmus cerrutii'' * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oocyst
Apicomplexans, a group of intracellular parasites, have life cycle stages that allow them to survive the wide variety of environments they are exposed to during their complex life cycle. Each stage in the life cycle of an apicomplexan organism is typified by a ''cellular variety'' with a distinct morphology and biochemistry. Not all apicomplexa develop all the following cellular varieties and division methods. This presentation is intended as an outline of a hypothetical generalised apicomplexan organism. Methods of asexual replication Apicomplexans (sporozoans) replicate via ways of multiple fission (also known as schizogony). These ways include , and , although the latter is sometimes referred to as schizogony, despite its general meaning. Merogony is an asexually reproductive process of apicomplexa. After infecting a host cell, a trophozoite ( see glossary below) increases in size while repeatedly replicating its nucleus and other organelles. During this process, the or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
