From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

The stichotrichs were a proposed group of ciliates, 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.[1] Although the group was made up of species traditionally classified among the "hypotrichs"--ciliates possessing compound ciliary organelles called cirri--it excluded euplotid ciliates such as Euplotes 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).[2]

Ciliate Uroleptus piscis categorized in Stichotrichia by Small and Lynn

In more recent classifications, members of Stichotrichia, as defined by Small and Lynn., are placed in the subclass Hypotrichia, and euplotid ciliates are placed in the subclass Euplotia. [3][4]

Like the euplotids, stichotrichs (or hypotrichs, in the sense of Gao et al., 2016)[3] have body cilia 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 include Stylonychia, Oxytricha, Uroleptus and Urostyla.


The term stichotrich derives from the ancient greek στίχος (stíkhos), meaning "row", and θρίξ, τριχός (thríx, trikhós), meaning 'hair',[5][6] because of the arrangement into rows of the cilia.


The draft macronuclear genome of Oxytricha trifallax was published in 2013.[7]


  1. ^ Lee JJ (2000). The Illustrated Guide to the Protozoa Vol. I. Lawrence, Kansas: Society of Protozoologists. pp. 394–5. ISBN 1-891276-22-0.
  2. ^ Lynn D (2008). The Ciliated Protozoa: Characterization, Classification, and Guide to the Literature (3 ed.). Springer Netherlands. ISBN 9781402082382.
  3. ^ a b Gao F, Warren A, Zhang Q, Gong J, Miao M, Sun P, et al. (April 2016). "The All-Data-Based Evolutionary Hypothesis of Ciliated Protists with a Revised Classification of the Phylum Ciliophora (Eukaryota, Alveolata)". Scientific Reports. 6: 24874. Bibcode:2016NatSR...624874G. doi:10.1038/srep24874. PMC 4850378. PMID 27126745.
  4. ^ Adl SM, Bass D, Lane CE, Lukeš J, Schoch CL, Smirnov A, et al. (January 2019). "Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes". The Journal of Eukaryotic Microbiology. 66 (1): 4–119. doi:10.1111/jeu.12691. PMC 6492006. PMID 30257078.
  5. ^ Bailly A (1981-01-01). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 2010035283. OCLC 461974285.
  6. ^ Bailly A. "Greek-french dictionary online". Retrieved 2017-01-24.
  7. ^ Swart EC, Bracht JR, Magrini V, Minx P, Chen X, Zhou Y, et al. (2013). "The Oxytricha trifallax macronuclear genome: a complex eukaryotic genome with 16,000 tiny chromosomes". PLoS Biology. 11 (1): e1001473. doi:10.1371/journal.pbio.1001473. PMC 3558436. PMID 23382650.

External links[edit]