The Cortex and Associated Structures of the Peritrich Ciliate Opercularia coarctataClaparede and Lachmann.A Light and Electron Microscopical Study

Ruiz, María Soledad; Anadón, Ramón

doi:10.1016/s0003-9365(88)80024-1

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…Separation of the telotroch from the stalk in V. convallaria happens as several well-choreographed steps, all of which center around the stalk-scopula junction. Our evidence and that of other investigators [lo, [13][14][15][16]22, 231 indicate that the stalkscopula junction is a "seam" that can be ruptured to separate the telotroch from the stalk. The cellular architecture of the scopula appears to facilitate detachment as much as it does attachment.…”

Section: Discussionsupporting

confidence: 74%

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The Fine Structure of the Scopula‐Stalk Region of Vorticella convallaria

Wibel

Vacchiano

Maciejewski

et al. 1997

J Eukaryotic Microbiology

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We examined by SEM and TEM the stalk-scopular junction, the stalk, and stalk formation in Vorticella convallaria Linnaeus, 1767. The stalk sheath is anchored to the walls of the scopular lip and to the scopular cilia by thin fibrils. Experimental extraction of these fibrils weakens this junction enough to separate the stalk from the cell body. Telotrochs escape from the stalk by means of violent contractions of the cell body, accelerated beating of the trochal band cilia, and twisting of the cell body against the stalk. The edges of the scopular lip spread over the scopular cilia after escape and, in some cases, fuse to enclose the entire, aboral scopular surface in a cupola-like structure. The sessile cells contain fewer and smaller scopular granules than telotrochs. The presence of disintegrating scopular granules in the stalk matrix of some sessile cells suggests that they contain material which is secreted over a period of time to form the stalk. Eruptive formation of the initial adhesive pad and quick elongation of the distal part of the stalk suggests a rapid exocytosis of the larger, more numerous granules of the telotroch. The stalk sheath is formed of fibrils making up complete and incomplete compartments peripherally arranged along the major stalk axis.

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Section: Discussionsupporting

confidence: 74%

“…Somatic myonemes also attach at the periphery of the scopula. A peripheral pellicular ridge, known as the scopular lip, surrounds the ciliary field, and it has been suggested that the region between the cilia and the lip forms a socket for insertion of the stalk [22,271. The fate of the scopular plate and scopular cilia of the telotroch form is controversial.…”

mentioning

confidence: 99%

The Fine Structure of the Scopula‐Stalk Region of Vorticella convallaria

Wibel

Vacchiano

Maciejewski

et al. 1997

J Eukaryotic Microbiology

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“…These similarities suggest to us that the scopula of the telotroch differentiates during metamorphosis to give rise to the adult scopula and a pair of scopular derivatives, both of which are carried at the tips of the growing cinctal arms and ultimately combine to form the bouton. We hypothesize that the circular arrays of microtubules originate as scopular kinetosomes during metamorphosis and give rise to the digitations in the bouton, which are homologues of the stereocilia described in the stalks of peritrichs [8, 12,14,17,181. As in other peritrichs, the homogeneous material is secreted through pellicular pores and is the homologue of the secreted matrix in peritrich stalks.…”

Section: Discussionmentioning

confidence: 99%

The Fine Structure of the Cinctum of Ellobiophrya conviva (Ciliophora: Peritricha)

Bradbury

Clamp

1991

The Journal of Protozoology

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Ellobiophrya conviva clasps tentacles of the bryozoan Bugula neritina with a ring-like structure formed from aboral extensions of its body that taper into two slender arms. The tips of the arms overlap and join to form a unique organelle, the bouton. Each arm contains a massive myoneme that splays out at the bouton. The bouton consists of the cupped tips of the arms and a cavity, which is filled with dense homogeneous material. Long digitations containing longitudinal microtubules at their periphery project from the inner surface of the tip of each arm into the cavity. Deep folds of pellicle with pores opening into their depths line the wall of the cavity. Conventional kinetosomes are not visible in the bouton, but circular or elliptical arrays of microtubules are found at the bases of digitations. The nonfunctional scopula of the adult is in a depression enclosed by pellicular folds. The bouton is distant from the scopula, but its fine structure somewhat resembles it, supporting Chatton and Lwoff's hypothesis that the cinctal arms carry parts of the scopula at their tips. The fine structure of the cinctum supports their suggestion that the cinctal arms are homologous to the spasmonemes of vorticellid peritrichs.

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“…The zooid of T. similis is bound by a pellicle whose structure is essentially similar to other sessile peritrichs (Bauer-Nebelsick et al, 1996;Carey and Warren, 1983;Eperon, 1985;González, 1978;Kawamura, 1973;Lom and Corliss, 1968;Ruiz and Anadon, 1988). However, compared with the conspicuous rounded alveoli in T. folliculata (Eperon and Grain, 1983;González, 1978González, , 1979 and the distinct concave alveoli in P. decumbens (Warren, 1983), the alveolar pattern of T. similis is different, being a thin, non-prominent space (Fig.…”

Section: Tem Observationmentioning

confidence: 93%

“…Few ultrastructural studies have been performed on peritrich ciliates (e.g., Bauer-Nebelsick et al, 1996;Bradbury, 1965;Couch, 1973;Eperon, 1985;Eperon and Grain, 1983;Fish and Goodwin, 1976;González, 1978González, , 1979Guinea et al, 1990;Lom and Corliss, 1968;McKanna, 1973;Ruiz and Anadon, 1988;Warren, 1983); as for the family Vaginicolidae, ultrastructural features have been studied in detail only for Thuricola folliculata and Platycola decumbens (Eperon, 1985;Eperon and Grain, 1983;González, 1978González, , 1979Warren, 1983). Thus, there are only few ultrastructure references to make a comparison with our data on T. similis, and similar multimethod studies on peritrichs with ultrastructural investigations are urgently needed to better understand the biodiversity and systematics of these ciliates.…”

Section: Tem Observationmentioning

confidence: 99%