Holotricha

(redirected from Holotrich)
Also found in: Dictionary, Wikipedia.

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 ?
leucocephala supplemented (% of DM) Items 0 20 40 60 80 SE Population of rumen protozoa Holotrich ([log.sub.10]) 4.0 4.1 4.1 3.9 4.1 0.18 Entodiniomorph ([log.sub.10]) 5.5 5.3 5.5 5.5 5.5 0.07 Total protozoa ([log.sub.10]) 9.5 9.4 9.6 9.3 9.6 0.19 Contrast Items L Q C Population of rumen protozoa Holotrich ([log.sub.10]) ns ns ns Entodiniomorph ([log.sub.10]) ns ns ns Total protozoa ([log.sub.10]) ns ns ns DM, dry matter; SE, standard error; L, linear contrast; Q, quadratic contrast; C, cubic contrast.
Total protozoa numbers, holotrichs, and entodiniomorph in the rumen of cattle were not affected at 6 h after intake of L.
No nematocysts found in primary tentacles; secondary tentacles with sparse, relatively smaller euryteles (5.4-9.5 X 3.3-5.6 [micro]m, n = 10) and no holotrichs.
The protozoa were differentiated into large (>100 pm) and small (<100 [micro]m) holotrich and entodiniomorph groupings.
Sequestration of holotrich protozoa in the reticulo-rumen of cattle.
The role of holotrichs in the metabolism of dietary linoleic acid in the rumen.
Influence of cassava substitution for corn meal on population of rumen microbes in growing goat fed on fed on elephant grass as a roughage Cassava levels in concentrate (%) Attribute T1 (0) T2 (25) T3 (50) Cassava chip 0.00 12.50 25.00 levels (DM basis) Total direct count Bacteria (x [10.sup.10] cell/ml) 0 h-post feeding 1.60 1.40 1.40 4 1.20 1.31 1.10 Mean 1.41 1.35 1.30 Total protozoa (x [10.sup.6] cell/ml) 0 h-post feeding 2.16 3.04 2.99 4 2.65 2.78 3.18 Mean 2.41 2.90 3.08 Holotrich sp.
At the outer limits of stability, very dense arrays of very long cnidae in defensive structures (e.g., capsule lengths [congruent to] 90 [micro]m for Metridium acontial amastigophores and Anthopleura acrorhagial holotrichs; Hand, 1955) actually do cause local tissue disintegration during firing (Abel, 1954; Francis, 1973b, Kramer and Francis, 2004).
Rumen metabolite revealed treatment effect for total volatile fatty acids (TVFA) acetic acid, propionic acid and butyric acids, holotrichs, spirotrichs and total protozoal population (Table 5).