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Schizocystidae
The Schizocystidae are a family of parasitic alveolates in the phylum Apicomplexa. Species in this family infect insects (Diptera, Coleoptera and Hemiptera). History This family was created by Léger and Duboscq in 1908. Taxonomy Three genera are currently recognised in this family. The type genus is ''Schizocystis''. Lifecycle The parasites develop in extracellular locations. The trophozoites are large, band like and wide. They have longitudinal striae and are aseptate. A mucron of small pseudopods or sucker is present. The nuclei are large. Merogony occurs once in the lifecycle. Nuclear division proceeds with binary fission during growth. Cytokinesis occurs to form uninucleate merozoites arranged in clusters in the shape of the trophozoite. The merozoites become free by dropping off the parent trophozoite. Gamonts, gametocysts and oocysts are of the actinocephalid type with syzygy occurring just before gametocyst formation. The young gamonts are vermiform (wormlike). Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neogregarinorida
The Neogregarinorida are an order of parasitic alveolates in the phylum Apicomplexa. Species in this order infect insects and are usually found in the fat body, hemolymph, hypodermis, intestine or Malpighian tubules. The most common site of infection is the fat body: many species are pathogenic for their hosts. The species in this order are predominantly intracellular parasites. Taxonomy Six families are in this order, with 13 genera. The type genus is '' Ophryocystis''. Two families (Ophryocystidae and Schizocystidae) belong to the suborder Schizogregarinina. They appear to have evolved from the Eugregarinorida. Merogony as part of the life cycle separates them from the Eugregarinorida and appears to have been derived as a secondary characteristic. A phylogenetic analysis of the small subunit RNA suggests ''Ophryocystis'' may actually be a eugregarine rather than a neogregarine. General characteristics * Merogony, gamogony and sporogony are present in all species * They ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lymphotropha
''Lymphotropha'' is a genus of parasitic alveolates in the phylum Apicomplexa. History This genus was created by Ashford in 1965. Taxonomy There is one species in this genus. Life cycle This genus infects the flour beetle ''Tribolium castaneum''. The 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 ...s enter the host by the oral route, usually by ingestion of contaminated food but also by cannibalism of an infected host. Infection with this genus increases larval mortality and interferes with normal development. References Apicomplexa genera {{Apicomplexa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schizocystis
Schizocystidae is a genus of parasitic alveolates in the phylum Apicomplexa. Species in this family infect insects (Diptera). History This genus was created by Léger in 1909.Leger L (1909) Le genre ''Schizocystis''. Arch Protistenk 18:83-110 Taxonomy The type species is ''Schizocystis gregarinoides''. Lifecycle The parasites develop in extracellular locations. The trophozoites are large, band like and wide. They have longitudinal striae and are aseptate. A mucron of small pseudopods or sucker is present. The nuclei are large. Merogony occurs once in the lifecycle. Nuclear division proceeds with binary fission during growth. Cytokinesis occurs to form uninucleate merozoites arranged in clusters in the shape of the trophozoite. The merozoites become free by dropping off the parent trophozoite. Gamonts, gametocysts and oocysts are of the actinocephalid type with syzygy occurring just before gametocyst formation. The young gamonts are vermiform (wormlike). The gametocysts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machadoella
''Machadoella'' is a genus of parasitic alveolates in the phylum Apicomplexa. Species in this genus infect species of the family Reduviidae. History This genus was created by Reichenow in 1935.Reichenow E (1935) ''Machadoella triatomae'' n.g., n. sp. eine Schizogregarine aus ''Triatoma dimidiata''. Arch Protistenk 84: 431 The type species - ''Machadoella spinigeri'' - was first described by Machado in 1913. Taxonomy Two species are currently recognised in this genus. Lifecycle The species in this genus develop in the Malphigian tubules of their host. The trophozoites are worm like with longitudinal folds. The schizonts are globular with multiple nuclei. The gamonts are elongated and slightly swollen at the level of the nucleus. Syzygy occurs at the anterior end of the gamonts. The gamete A gamete (; , ultimately ) is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproduc ... [...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] |
Mucron
A ''mucron'' is an attachment organelle found in archigregarines - an order of epicellular parasitic Conoidasida.Simdyanov TG, Guillou L, Diakin AY, Mikhailov KV, Schrével J, Aleoshin VV. (2017) A new view on the morphology and phylogeny of eugregarines suggested by the evidence from the gregarine ''Ancora sagittata'' (Leuckart, 1860) Labbé, 1899 (Apicomplexa: Eugregarinida) PeerJ 5:e3354 https://peerj.com/articles/3354/?td=wk The mucron is derived from the apical complex, which is found in all members of the phylum Apicomplexa.Adl SM, Simpson AG, Lane CE, Lukeš J, Bass D, Bowser SS, Brown M, Burki F, Dunthorn M, Hampl V, Heiss A, Hoppenrath M, Lara E, leGall L, Lynn DH, McManus H, Mitchell EAD, Mozley-Stanridge SE, Parfrey LW, Pawlowski J, Rueckert S, Shadwick L, Schoch C, Smirnov A, Spiegel FW. (2012) The revised classification of eukaryotes. Journal of Eukaryotic Microbiology 59:429-514. https://doi.org/10.1111/j.1550-7408.2012.00644.x The mucron is located at the anterior (a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 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 org ... [...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] |
Trophozoite
A trophozoite (G. ''trope'', nourishment + ''zoon'', animal) is the activated, feeding stage in the life cycle of certain protozoa such as malaria-causing ''Plasmodium falciparum'' and those of the '' Giardia'' group. (The complement of the trophozoite state is the thick-walled cyst form). Life cycle stages Trophozoite and cyst stages are shown in the life cycle of '' Balantidium coli'' the causative agent of balantidiasis. In the apicomplexan life cycle the trophozoite undergoes schizogony (asexual reproduction) and develops into a schizont which contains merozoites 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 .... The trophozoite life stage of '' Giardia'' colonizes and proliferates in the small intestine. Trophozoites develop during the course of the infection into cysts whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merozoite
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 org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
