The fine structure of ceratium tripos, a marine armored dinoflagellate

Wetherbee, Richard

doi:10.1016/s0022-5320(75)90009-x

Cited by 21 publications

(3 citation statements)

References 15 publications

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“…12) reveal an osmiophilic, wrinkled membranous structure in the position where a plate should occur. Comparison of their observations to those of amphiesmal development of Ceratium tripos (Muller) Dujardin, 1841, reported by Wetherbee (1975) indicates that the structures in the thecal vesicles of Gymnodinium fuscum are not cellulosic plates but rather the osmiophilic structure which Wetherbee terms the 'thecal membrane'. In his study of thecal ontogeny the 'thecal membrane' precedes formation of the theca.…”

Section: Micro Adriatic a 201mentioning

confidence: 88%

Observations on the theca of the motile phase of free-living and symbiotic isolates ofZooxanthella microadriatica(Freudenthal) comb.nov.

1979

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Section: Micro Adriatic a 201mentioning

confidence: 88%

Observations on the theca of the motile phase of free-living and symbiotic isolates ofZooxanthella microadriatica(Freudenthal) comb.nov.

1979

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“…The outer membrane of the cytoplasmic vacuoles is localized in this zone but this compartment is permanently present in cells of many dinoflagellates and is likely to remain stable during the membrane rearrangements (e.g. Wetherbee, 1975;Morrill, 1984;Klut et al, 1985;Lucas and Vesk, 1990;Bricheux et al, 1992). Moreover, we consider the presence of small vesicles and flattened tubules in the amorphous zone as evidence in favor of our hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural aspects of ecdysis in the naked dinoflagellate Amphidinium carterae

Berdieva¹,

Safonov²,

Matantseva³

2019

Protistology

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The stressor-induced ecdysis takes a special place in dinoflagellate biology. During ecdysis, a cell loses the plasmalemma, outer amphiesmal vesicle membrane and, in armored species, thecal plates, becomes immotile, and then amphiesma regeneration occurs. Here we report the results of our study of cell covering rearrangement during ecdysis in the naked dinoflagellate species Amphidinium carterae Hulburt 1957. Ecdysis was induced by mechanical treatment (centrifugation). The changes in cell organization at the ultrastructural level were examined using transmission electron microscopy methods. Shedding of the plasma membrane and the outer amphiesmal vesicle membranes, fusion of the inner amphiesmal vesicle membranes were observed. The amorphous cytoplasm zone, which underlies inner amphiesmal vesicle membranes in motile cells, retains under the new plasma membrane in ecdysed cells. We showed accumulation of small vesicles and flattened tubules that apparently begin fusion to form juvenile amphiesmal vesicles in this zone. The absence of pellicle in Amphidinium dinoflagellates was suggested.

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“…Ceratium tripos lacks a pellicle (Wetherbee, 1975 a) while H. niei possesses this structure (Loeblich, 1970). During division the parental thecal plates and pellicle (if present) are subdivided between the daughter cells (Loeblich, 1970).…”

Section: Introductionmentioning

confidence: 99%

Cell division and reformation of the amphiesma in the pelliculate dinoflagellate,Heterocapsa niei

Morrill

Loeblich

1984

J. Mar. Biol. Ass.

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Cytokinesis is described for the first time in a pelliculate dinoflagellate that retains its thecal plates during cell division. In Heterocapsa niei cytokinesis proceeded in a manner that differed from that described for other dinoflagellates. The thecal plates separated along the fission line before the development of a cleavage furrow. A distinct cleavage furrow developed as cytokinesis progressed. The outer membrane and the outer plate membrane expanded during division to enclose the enlarging cell undergoing cytokinesis; however, as the cleavage furrow deepened, these membranes were not continuous with the cytoplasm. The pellicle was occasionally intermittent in the region of the cleavage furrow, possibly facilitating movement of material from the cytoplasm to the developing outer membranes. Thecal plate formation occurred within the thecal vesicle from unrecognizable precursors.

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The fine structure of ceratium tripos, a marine armored dinoflagellate

Cited by 21 publications

References 15 publications

Observations on the theca of the motile phase of free-living and symbiotic isolates ofZooxanthella microadriatica(Freudenthal) comb.nov.

Observations on the theca of the motile phase of free-living and symbiotic isolates ofZooxanthella microadriatica(Freudenthal) comb.nov.

Ultrastructural aspects of ecdysis in the naked dinoflagellate Amphidinium carterae

Cell division and reformation of the amphiesma in the pelliculate dinoflagellate,Heterocapsa niei

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