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 now used only as a physical description, although it has appeared in many earlier classifications. They were one of two orders in the classification of ciliates introduced by Otto Bütschli in 1889:

Class Ciliata
Order Holotricha
Suborder Gymnostomata
Suborder Trichostomata
Suborder Astomata
Order Spirotricha
Suborder Heterotricha
Suborder Oligotricha
Suborder Hypotricha
Suborder Peritricha

In this system the spirotrichs included all ciliates that have prominent oral cilia, and the holotrichs all those that lack them. Later the peritrichs, as well as the chonotrichs, were either given their own groups or considered unusual holotrichs. In 1974, de Puytorac and various other workers abandoned the holotrichs, dividing them into the classes Oligohymenophorea and Kinetofragmophora. The latter have since been divided into several more classes, and the gymnostomes in particular have been split into several different groups.

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Look at other dictionaries:

  • holotrich — hol·o·trich …   English syllables

  • holotrich — ˈhälə.ˌtrik, ˈhōl noun ( s) Etymology: New Latin Holotricha : a protozoan of the order Holotricha …   Useful english dictionary

  • Nesselzelle — Die Nesselzellen, auch als Nematocyten oder Cnidozyten bezeichnet, sind ein spezieller Zelltyp, der ausschließlich bei den Nesseltieren (Cnidaria) zu finden ist. Es handelt sich dabei um Zellen, die in der äußeren Schicht (Epidermis) der Tiere… …   Deutsch Wikipedia

  • 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

  • hol|o|trich — «HOL uh trihk», noun. any one of a group of protozoans uniformly covered with cilia: »The paramecium is a holotrich. ╂[< holo + Greek thríx, trichós hair] …   Useful english dictionary

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