dcsimg

Description of Nassophorea

provided by BioPedia
Intramacreonucleate ciliates; somatic cilia as monokinetids, dikinetids or polykinetids; monokinetid with anterior, tangential transverse ribbon, a divergent postciliary ribbon, and anteriorly-directed kinetodesmal fibril; for dikinetids, only the anterior kinetosome has a transverse ribbon while the posterior kinetosome has postciliary ribbon and kinetodesmal fibril; polykinetids are cirrus-like in one family (i.e., Discotrichidae); somatic alveoli well-developed with paired alveolocysts present in two orders; cyrtos well-developed in several groups, and typical of class; oral polykinetids having alveoli between kinetosomal rows; extrusomes, when present, are trichocysts.
license
cc-by-nc
author
biopedia
provider
BioPedia
original
visit source
partner site
BioPedia

Nassophorea

provided by wikipedia EN

The Nassophorea are a class of ciliates.[1] Members are free-living, usually in freshwater but also in marine and soil environments. The mouth is anterior ventral and leads to a curved cytopharynx supported by a prominent palisade of rods or nematodesmata, forming a structure called a cyrtos or nasse, typical of this and a few other classes. When present, extrusomes take the form of fibrous trichocysts. Cilia are usually monokinetids, but vary from order to order.

The Synhymeniida and Nassulida have mostly uniform cilia arising from monokinetids. Among the former, and a few members of the latter, there is a series of small polykinetids running from below the mouth to the left side of the body and sometimes almost circling the cell, called a frange or synhymenium. Other forms only have three oral membranelles, sometimes extending out of the oral cavity, with or without a paroral membrane. These are usually medium in size, sometimes larger, and cylinder shaped.

The Microthoracida typically have three or more oral membranelles, with at least a vestige of the paroral membrane occurring during cell division. The body cilia are sparse, and often arise from dikinetids, with cirrus-like polykinetids occurring in the marine genus Discotricha. These are usually small and ellipsoid or crescent shaped, with the right side of the body curved outward, and generally have a rigid pellicle.

As first defined by Eugene Small and Denis Lynn in 1981, the Nassophorea also included the peniculids and, in a separate subclass, the hypotrichs. More recent schemes restore these to their earlier positions, leaving this group a relatively small collection of less well-known forms.

References

  1. ^ Margulis L, Chapman MJ (2009). Kingdoms and Domains: An Illustrated Guide to the Phyla of Life on Earth. Academic Press. p. 601. ISBN 9780080920146. Retrieved 20 January 2018.
 title=
license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN

Nassophorea: Brief Summary

provided by wikipedia EN

The Nassophorea are a class of ciliates. Members are free-living, usually in freshwater but also in marine and soil environments. The mouth is anterior ventral and leads to a curved cytopharynx supported by a prominent palisade of rods or nematodesmata, forming a structure called a cyrtos or nasse, typical of this and a few other classes. When present, extrusomes take the form of fibrous trichocysts. Cilia are usually monokinetids, but vary from order to order.

The Synhymeniida and Nassulida have mostly uniform cilia arising from monokinetids. Among the former, and a few members of the latter, there is a series of small polykinetids running from below the mouth to the left side of the body and sometimes almost circling the cell, called a frange or synhymenium. Other forms only have three oral membranelles, sometimes extending out of the oral cavity, with or without a paroral membrane. These are usually medium in size, sometimes larger, and cylinder shaped.

The Microthoracida typically have three or more oral membranelles, with at least a vestige of the paroral membrane occurring during cell division. The body cilia are sparse, and often arise from dikinetids, with cirrus-like polykinetids occurring in the marine genus Discotricha. These are usually small and ellipsoid or crescent shaped, with the right side of the body curved outward, and generally have a rigid pellicle.

As first defined by Eugene Small and Denis Lynn in 1981, the Nassophorea also included the peniculids and, in a separate subclass, the hypotrichs. More recent schemes restore these to their earlier positions, leaving this group a relatively small collection of less well-known forms.

license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN