Hypotrich

Hypotrich

Taxobox | color = khaki
name = Hypotrichs


domain = Eukaryota
unranked_phylum = Alveolata
phylum = Ciliophora
classis = Spirotrichea
subclassis = Hypotrichia
subclassis_authority = Stein 1859 "emend."
subdivision_ranks = Typical orders
subdivision = Euplotida
KiitrichidaThe hypotrichs are a group of ciliate protozoa, included among the spirotrichs. Most are oval in shape, with a rigid pellicle, and have cirri distributed in isolated tufts on the ventral surface of the cell. Some also have dorsal cilia, which function as sensory bristles. "Euplotes" and "Aspidisca" are common genera. Like other ciliates, hypotrichs reproduce by cell division and conjugation.

The hypotrichs were first defined by Friedrich von Stein in 1859. Originally the stichotrichs, which also have cirri, were included here, but they were separated out by Small & Lynn, 1981, who placed the restricted hypotrichs among the Nassophorea because of various peculiarities in their infraciliature. More recent schemes reverse this move, and some molecular studies suggest they may be paraphyletic to the stichotrichs as currently defined.

External links

* [http://cabfst28.cnea.gov.ar/~zanette/micro/hypotrichida/ Hypotrich photographs (text in Spanish)]


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  • hypotrich — hypotrichous /huy po tri keuhs/, adj. /huy peuh trik/, n. any ciliate of the suborder Hypotricha, having cilia chiefly on the ventral surface. [ < NL Hypotricha; see HYPO , TRICHA] * * * ▪ protozoan  any dorsoventrally flattened, oval protozoan… …   Universalium

  • hypotrich — noun Any of a group of ciliate protozoa included among the spirotrichs, mostly oval in shape with a rigid pellicle and isolated tufts of cirri on the ventral surface of the cell …   Wiktionary

  • hypotrich — hy·po·trich …   English syllables

  • hypotrich — ˈ ̷ ̷ ̷ ̷+ˌtrik noun ( s) Etymology: New Latin Hypotricha : one of the Hypotricha * * * hypotrichous /huy po tri keuhs/, adj. /huy peuh trik/, n. any ciliate of the suborder Hypotricha, having cilia chiefly on the ventral surface. [ …   Useful english dictionary

  • Spirotrich — Taxobox | color = khaki name = Spirotrichs image caption = Euplotes, a spirotrich domain = Eukaryota unranked phylum = Alveolata phylum = Ciliophora classis = Spirotrichea classis authority = Bütschli 1889 subdivision ranks = Typical sublasses… …   Wikipedia

  • Stichotrich — Taxobox | color = khaki name = Stichotrichs image caption = Stichotrich domain = Eukaryota unranked phylum = Alveolata phylum = Ciliophora classis = Spirotrichea subclassis = Stichotrichia subclassis authority = Small Lynn 1985 subdivision ranks …   Wikipedia

  • Holotrich — Holotrichs are ciliate protozoa that have relatively uniform cilia over their body, and lack or only have a few prominent oral membranelles. Most of the major lines of ciliates are holotrichous. They do not form a natural group, so the term is… …   Wikipedia

  • cirri — (= cirrus (singular ) Large motor organelles of hypotrich ciliates: formed from fused cilia …   Dictionary of molecular biology

  • Euplotes — Genus of free living hypotrich Protozoa. Do not have cilia but may have undulating membranes for propulsion …   Dictionary of molecular biology

  • protozoan — /proh teuh zoh euhn/, n., pl. protozoans, (esp. collectively) protozoa / zoh euh/, adj. Biol. n. 1. any of a diverse group of eukaryotes, of the kingdom Protista, that are primarily unicellular, existing singly or aggregating into colonies, are… …   Universalium

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