Vorticella


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Vorticella

 

a genus of protozoans of the subclass Peritricha. More than 100 species are widely distributed in salt and fresh waters. Unlike other Peritricha, vorticellae are sessile, attaching themselves to a substrate by means of a nonbranching contractile stalk. The bell-shaped body lacks cilia. On the wide anterior end (adoral zone) is a double row of cilia that usually coalesce into membranelles involuted to the left (in contrast to protozoans of the subclass Spirotricha, whose membranelles curl to the right). The circumoral spiral leads to an oral opening. Vorticellae feed on small organic particles suspended in the water (for example, bacteria and detritus). In asexual reproduction, free-swimming zoospores equipped with a crown of cilia are formed as a result of division. They subsequently acquire a stalk and attach themselves to a substrate. The sexual process is a form of anisogamous conjugation, that is, the fusion of immotile macroconjugants and motile microconjugants. Some vorticellae are ectoparasites of fish.

IU. I. POLIANSKII

References in periodicals archive ?
In order to determine the respective areas occupied by the fibrillar mass and the tubules, Vorticella cells were fixed under conditions that are optimal for staining membranes using a protocol by David H.
Western blot analysis, using protein from Vorticella whole cell lysates, was performed to confirm that each antibody recognized distinct Vorticella centrin/spasmin proteins.
2004), our study shows N-termVcCentrin4-antibody labels the Vorticella myonemal system composed of longitudinal fibers running from the base of the peristomial disc/lip of the cell body to the junction between the scopular lip and the stalk (Fig.
Reversible mechanochemical cycle in contraction of Vorticella.
Structure and coiling of the stalk in the peritrich ciliates Vorticella and Carchesium.
Cloning and expression of a cDNA encoding a Vorticella convallaria spasmin: an EF-hand calcium-binding protein.
Infestations associated with ciliates of the epistylid genera Epistylis and Opercularia, the vorticellid genera Vorticella and Zoothamnium, and suctorians of the acinetid genera Acineta, Acinetides and Tokophrya, have been reported from adult Macrobrachium rosenbergii cultured in ponds in Limon Province, on the Caribbean coast of Costa Rica [14, 15, 23].
Potential use of a ciliate, Vorticella microstoma, surviving in lead contaminated industrial effluents in wastewater treatment.