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The stichotrichs were a proposed group of
The term ''stichotrich'' derives from the
The stichotrichs were a proposed group of ciliate
The ciliates are a group of alveolates characterized by the presence of hair-like organelles called cilia, which are identical in structure to flagellum, eukaryotic flagella, but are in general shorter and present in much larger numbers, with a ...
s, in the class Spirotrichea. In a classification system proposed by Eugene Small and Denis Lynn in 1985, Stichotrichia formed a subclass containing four orders: Stichotrichida, Urostylida, Sporadotrichida and Plagiotomida. Although the group was made up of species traditionally classified among the " hypotrichs"--ciliates possessing compound ciliary organelles
In cell biology, an organelle is a specialized subunit, usually within a cell, that has a specific function. The name ''organelle'' comes from the idea that these structures are parts of cells, as organs are to the body, hence ''organelle,'' the ...
called cirri
Giovanni Battista Cirri (1 October 1724 – 11 June 1808) was an Italian cellist and composer in the 18th century.
Biography
Cirri was born in Forlì in the Emilia-Romagna Region of Italy. He had his first musical training with his brother ...
--it excluded euplotid ciliates such as ''Euplotes
''Euplotes'' is a genus of ciliates in the subclass Euplotia. Species are widely distributed in marine and freshwater environments, as well as soil and moss. Most members of the genus are free-living, but two species have been recorded as commens ...
'' and ''Diophrys'', which were placed in the subclass Hypotrichia. In later classifications proposed by Denis Lynn, Stichotrichia omits the order Plagiotomida (species in that group were relocated to the order Stichotrichida).
In more recent classifications, members of Stichotrichia, as defined by Small and Lynn., are placed in the subclass Hypotrichia
The hypotrichs are a group of ciliated protozoa, common in fresh water, salt water, soil and moss. Hypotrichs possess compound ciliary organelles called " cirri," which are made up of thick tufts of cilia, sparsely distributed on the ventral ...
, and euplotid ciliates are placed in the subclass Euplotia.
Like the euplotids, stichotrichs (or hypotrichs, in the sense of Gao et al., 2016) have body cilia
The cilium, plural cilia (), is a membrane-bound organelle found on most types of eukaryotic cell, and certain microorganisms known as ciliates. Cilia are absent in bacteria and archaea. The cilium has the shape of a slender threadlike projecti ...
fused into cirri, but these are mostly arranged into rows, running along the ventral surface or edges of the cell. Most stichotrichs are flattened and reasonably flexible, although some, such as ''Stylonychia'', have rigid bodies. Characteristic genera
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...
include ''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, ...
'', ''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 ...
'', ''Uroleptus
''Uroleptus'' is a genus of ciliate
The ciliates are a group of alveolates characterized by the presence of hair-like organelles called cilia, which are identical in structure to flagellum, eukaryotic flagella, but are in general shorter and ...
'' and ''Urostyla''.
Etymology
The term ''stichotrich'' derives from the ancient greek
Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...
(), meaning "row", and , (), meaning 'hair', because of the arrangement into rows of the cilia.
Genomics
The draft macronuclear genome of ''Oxytricha trifallax
''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 organism, model for ciliate genetics.
Genetics
Like all ...
'' was published in 2013.
References
External links
* Spirotrichea Obsolete eukaryote taxa {{ciliate-stub