Morphological Studies on Three Vorticella Species

Reid, Rosemary

doi:10.2307/3224271

Cited by 10 publications

(4 citation statements)

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“…Ectoplasmic ridges in fully developed telotrochs and microgamonts were 150-250 nm wide and cilia averaged 13 p (Figs. 22,33). The number of rows of developing cilia could not be determined.…”

Section: Resultsmentioning

confidence: 99%

“…The nature of these particles was puzzling (21 ) . Some workers suggested that they were symbiotic bacteria [ 2, 18,22). However, some of the most important characteristics of typical bacteria (or even atypical bacteria, such as rickettsiae and psittacosis agents) had not been found in kappa and its "relatives" prior to this study.…”

Section: Fig 29 Aboral Region Of a Telotroch With A Prominent Scopulamentioning

confidence: 85%

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Scanning Electron Microscope Observations on Some Life History Stages of Carchesium polypinum (Ciliata, Peritrichia)1

Zagon

1971

The Journal of Protozoology

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SYNOPSIS. Sessile zooids, and mobile telotrochs and microgamonts of Carchesium polypinum (Protozoa, Ciliata, Peritrichia), were examined by scanning electron microscopy. The results were compared to earlier light and electron microscope studies in order to investigate structural changes concerned with adaptation and differentiation. Telotrochs and microgamonts always had a contracted peristome and usually had a long phalange of cilia. Striae around the contracted buccal apparatus in all 3 stages were convoluted and often had thickened margins; those in telotrochs and microgamonts had oral‐aboral ectoplasmic cross‐connections. Nonbuccal striae of telotrochs and microgamonts varied in structure and height differences between epiplasmic peaks and alveoli surface membranes. The number of striae were constant in all 3 stages. Pellicular pore structure did not vary in any of the stages examined and resembled parasomal sacs located near buccal structures. Fully relaxed sessile zooids had ectoplasmic ridges coursing from polykinety kinetosomes and cilia to an area in front of the ciliated portion of the haplokinety; these ridges were interpreted to be the interkinetal fibers. Telotroch bands of sessile zooids consisted of 2 or 3 parallel ectoplasmic ridges which circled the aboral region and contained structures resembling pores. Telotroch bands in telotrochs and microgamonts had 2 enlarged, parallel ectoplasmic ridges circling the aboral region; telotroch band cilia were found between these ridges. In addition, a fold‐like, ectoplasmic structure extended beyond the 2 ridges and was located between the telotroch band cilia and the aboral ridge. The epiplasmic shelf surrounding the stalk in sessile zooids was enlarged in telotrochs, and cilia were seen in the scopula depression. No scopula organelle was seen in any microgamont.

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Section: Resultsmentioning

confidence: 99%

Section: Fig 29 Aboral Region Of a Telotroch With A Prominent Scopulamentioning

confidence: 85%

Scanning Electron Microscope Observations on Some Life History Stages of Carchesium polypinum (Ciliata, Peritrichia)1

Zagon

1971

The Journal of Protozoology

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“…) . The investigations of Reid (1967) should be continued on other populations . • picta (Ehrenberg, 1831), Abh .…”

Section: Sla and Weg : Vorticella Microstoma Hians Faurmentioning

confidence: 99%

Taxonomic and nomenclatural revision of Sl�de?ek's list of ciliates (Protozoa: Ciliophora) as indicators of water quality

Foissner

1988

Hydrobiologia

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A taxonomic and nomenclatural revision of Sladecek's et al. (1981) and Wegl's (1983) lists of ciliates (Protozoa : Ciliophora) as indicators of water quality has been performed . The original reference, important synonyms, and modern taxonomic literature are provided for each of the 378 taxa recognized . The results of this revision are summarized in a table which shows the correct (modern) name, author, and date of publication of each species as well as its saprobity, its saprobic valency, its indicative weight, and its saprobic index .

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“…Vorticella has a polymorphic life cycle consisting of a stalked-feeding zooid or trophic stage, a motile form, termed a telotroch, and sexual forms including a micro and macrogamont (13,23,28,741. The trophic form of V. convaIIariu consists of a vase or inverted bell-shaped cell body [60,62. 771 equipped at the oral end of the cell with a large wreath of peristomal cilia which it uses for feeding [17,40,461.…”

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confidence: 99%

Vorticella: “A Cell For All Seasons”1

Buhse

1998

J Eukaryotic Microbiology

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UR studies on the peritrich ciliate, Vorticella convallaria 0 did not begin in a vacuum and much credit for our success must go to scientists who have gone before. One of those upon whom we depended most was Dr. Harold Finley and his students and colleagues who contributed much to enlighten us about Vorticella's potential as a research tool for the study of biological problems. Dr. Finley's Past Presidential Address to the Society entitled, "What have Peritrichs Taught Us" [27] in the then Journal of Protozoology gives an excellent historical exposition about peritrichs in general and Vorticella in particular. Examples of his breadth of study using peritrichs may be seen in the following selected citations: biochemistry 1291, conjugation and sexual differentiation [23, 24, 251, cytology [13], ecology [22, 301, encystment [28], growth and nutritional studies [26, 631, and taxonomy [53].Our goals in studying Vorticella convalZariu include understanding the morphogenetic transitions of the cell, understanding the mechanism of stalk formation, and elucidating the components of the contractile spasmoneme. One continuing interest has been to elucidate the mechanism that transforms V. convallaria from the feeding trophont-stage to the motile telotrochstage. We hope that by investigating this process we can develop a chemical method of synchronous telotroch formation from large populations of sessile vorticellan cells. Then, we can begin the task of deciphering the mechanics of this transitional change.We are also interested in knowing more about stalk formation. Previous work in this area (Suchard, J. S. 1979. An analysis of the morphogenic events leading to telotroch formation, settlement, and stalk development in the peritrich ciliate Zoothumnium arhusculu. Dissertation. University of Maryland, College Park, MD) [81] has shown that stalk formation is correlated with exocytosis of granules found in the aboral region of the telotroch. We are interested in extending these studies by tracing the pathway of these precursor materials into the stalk itself using stalk-specific antibodies. Last, but surely not least, we are interested in studying the spasmoneme contractile mechanism including cloning and sequencing the gene coding for the protein spasmin. This protein is believed to be a member 'Past-President's Address dedicated to the memory of Harold E. Finlay, of the centrin family of calcium-binding EF-hand proteins that includes centridcaltractin.In any pioneering study, there is a myriad of hurdles to be overcome before one can move on to solving interesting problems. Therefore, in order to carry out these studies, it was important to be able to grow Vorticella in a controlled manner and to be able to manipulate its life cycle.1. Problem #I-Catch the rabbit. There is an old saying that goes like this, "In order to make rabbit stew, one must first catch the rabbit." In this case, the rabbit is Vorticella and the stew is a medium that allows full growth of this peritrich. Our cells, used in the studies described below, ...

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Morphological Studies on Three Vorticella Species

Cited by 10 publications

References 4 publications

Scanning Electron Microscope Observations on Some Life History Stages of Carchesium polypinum (Ciliata, Peritrichia)1

Scanning Electron Microscope Observations on Some Life History Stages of Carchesium polypinum (Ciliata, Peritrichia)1

Taxonomic and nomenclatural revision of Sl�de?ek's list of ciliates (Protozoa: Ciliophora) as indicators of water quality

Vorticella: “A Cell For All Seasons”1

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