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Oxytrichidae
Oxytrichidae is a family of ciliates in the order Sporadotrichida. Oxytrichidae are morphologically diverse, ranging in length from 40 micrometres (e.g. '' Oxytricha setigera'') to 400 micrometers (e.g. '' Coniculostomum monilata''). They are generally elliptical in shape with some very flexible while others are rigid. Like other ciliates, Oxytrichidae have two or more nuclei: a large macronucleus that generally stretches across much of the cell body, and one or more smaller micronuclei Micronucleus is the name given to the small nucleus that forms whenever a chromosome or a fragment of a chromosome is not incorporated into one of the daughter nuclei during cell division. It usually is a sign of genotoxic events and chromosomal i .... References Spirotrichea Ciliate families {{Ciliate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylonychia
''Stylonychia'' is a genus of ciliates, in the subclass Hypotrichia. Species of ''Stylonychia'' are very common in fresh water and soil, and may be found on filamentous algae, surface films, and among particles of sediment. Like other Hypotrichs, ''St ylonychia'' has cilia grouped into membranelles alongside the mouth and cirri over the body. It is distinguished partly by long cirri at the posterior, usually a cluster of three. The largest can just be seen at a 25x magnification, and the smallest can just be seen at a 450x magnification. Description ''Stylonychia'' cells are roughly oval in shape, inflexible and flattened from back to front. The organism's cilia are grouped into structures called "cirri," tufts of joined cilia that function together as a unit. The cirri on the ventral surface of the cell can function as legs, enabling the organism to walk along solid substrates, such as submerged algae, leaves or debris. LIke other ciliates of the family Oxytrichidae, ''Stylo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oxytricha
''Oxytricha'' is a genus of ciliates in the family Oxytrichidae. Genomics The draft macronuclear genome of ''Oxytricha trifallax'' was published in 2013. Species References Spirotrichea Ciliate genera {{Ciliate-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sterkiella Histriomuscorum
''Sterkiella histriomuscorum'', formerly ''Oxytricha trifallax'', is a ciliate species in the genus '' Sterkiella'', known for its highly fragmented genomes which have been used as a model for ciliate genetics. Genetics Like all ciliates, ''O. trifallax'' has two different types of nuclei: macronuclei, which are the site of transcription and gene expression, and micronuclei, which are only active during sexual reproduction but are otherwise transcriptionally inactive. Macronuclei are formed by the differentiation of micronuclei, which usually involves some degree of RNA-mediated DNA editing. ''O. trifallax'' is the first species sequenced with an unusually high degree of fragmentation in its macronuclear genome. Up to 96% of the micronuclear genome is eliminated during the differentiation into a macronucleus; in comparison, in other ciliates like ''Paramecium'' only about 30% is eliminated. The macronuclear genome has a haploid size of about 50 Mbp. The chromosomes of the macro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Incertae Sedis
' () or ''problematica'' is a term used for a taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertainty at specific taxonomic levels is indicated by ' (of uncertain family), ' (of uncertain suborder), ' (of uncertain order) and similar terms. Examples *The fossil plant '' Paradinandra suecica'' could not be assigned to any family, but was placed ''incertae sedis'' within the order Ericales when described in 2001. * The fossil ''Gluteus minimus'', described in 1975, could not be assigned to any known animal phylum. The genus is therefore ''incertae sedis'' within the kingdom Animalia. * While it was unclear to which order the New World vultures (family Cathartidae) should be assigned, they were placed in Aves ''incertae sedis''. It was later agreed to place them in a separate order, Cathartiformes. * Bocage's longbill, ''Motacilla bocagii' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steina (ciliate)
Steina is a municipality in the district of Bautzen, in Saxony, Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe .... References Populated places in Bautzen (district) {{Bautzen-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
