Holotricha

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Holotricha

 

an order (or subclass) of protozoans of the class Infusoria. The cilia are either evenly distributed over the entire body or are developed predominantly on the ventral side. The Holotricha usually have special peristomial cilia, which often fuse into undulating membranes, of which there are usually three. There is no peristomial spiral of membranelles. More than 3,000 species are known. The Holotricha are particularly numerous in fresh and marine waters. There are parasitic forms, including the parasite of the fish Ichthyophthirius.

References in periodicals archive ?
The lowest total ciliate protozoal count was observed just before feeding in all the experimental groups, followed by an abrupt increase in the number of holotrich as well as spirotrich protozoa at 3 h post-feeding in supplemented grounds whereas the protozoal number gradually increased up to 6 h post-feeding in the lambs of unsupplemented group.
The protozoa were assessed as total count only without attempting to differentiate between the various species, although it was apparent that in most samples the entodiniomorphs were the dominant species followed by Holotrich.
Sequestration of holotrich protozoa in the reticulo-rumen of cattle.
capsule length of acrorhagial holotrichs [congruent to] 90 [micro]m; Hand, 1955), it would not explain scaling of the much smaller acrorhagial spirocysts interspersed among them (capsule lengths [congruent to] 30[mu], this study).