Comparative fine structure of pellicular cytoskeleton in EuglenaEhrenberg

Dragoş, Nicolae; Péterfi, Leontin Ştefan; Popescu, C

doi:10.1016/s0003-9365(97)80008-5

Cited by 15 publications

(19 citation statements)

References 16 publications

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“…1). Dragos, Péterfi, and Popescu (1997) used the synonymous terms “anterior plate‐like projection” and “posterior plate‐like projection,” respectively. The qualifying terms “anterior” and “posterior” were abandoned because they have no descriptive value for taxa with strips arranged longitudinally.…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies have shown that the morphology of the individual strips varies among taxa and is quite complex (Angeler, Müllner, and Schagerl 1999; Bourrelly, CoutC, and Rino 1976; Bricheux and Brugerolle 1986, 1987; Dragos, Péterfi, and Craciun 1979; Dragos, Péterfi, and Popescu 1997; Dubreuil and Bouck 1985; Farmer and Triemer 1994; Gerola and Bassi 1981; Leedale 1964; Leedale and Hibberd 1974; Mignot 1965, 1966; Mikolajczyk 1975; Suzaki and Williamson 1986a, 1986b). Some authors have linked specific sub‐structural features of strips to the degree of euglenoid movement (Dawson and Walne 1991; Dragos, Péterfi, and Popescu 1997; Dubreuil and Bouck 1985; Leedale and Hibberd 1974; Mikolajczyk 1975; Suzaki and Williamson 1985, 1986a, 1986b). It has also been demonstrated that the morphology of the strips remains almost invariable in both the relaxed and contracted stages of euglenoid movement (Suzaki and Williamson 1985, 1986a).…”

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confidence: 99%

“…Papers that have focused on strip substructure often use different terms for homologous structures or the same terms for entirely different structures (e.g. Bricheux and Brugerolle 1986, 1987; Dawson and Walne 1991; Dragos, Péterfi, and Craciun 1979; Dragos, Péterfi, and Popescu 1997; Gerola and Bassi 1981; Hofmann and Bouck 1976; Leedale 1964; Mignot 1965; Mignot, Brugerolle, and Bricheux 1987; Mikolajczyk 1975; Suzaki and Williamson 1985, 1986a, 1986b). This confusing terminology makes it difficult to compare the reconstructions of pellicle strips by different authors.…”

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confidence: 99%

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Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure

Leander

Farmer

2001

J Eukaryotic Microbiology

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The morphological diversity associated with the strip substructure of the euglenid pellicle was examined, and after identifying characters and states, we outlined hypotheses about their evolution. We have attempted to standardize terms necessary for analytical comparisons of strips by providing a glossary and comparing published synonyms. Most of the substructural diversity found in euglenids is demonstrated with 13 representative taxa. Strips are generally composed of two subcomponents: frames and projections. Frames support the basic shape of strips and many can be described as either S-shaped, plateau-shaped, M-shaped, or A-shaped. Projections branch laterally from the frames, are usually periodic, and can be described as thread-like structures, an indented plate, tooth-like structures, and plate-like structures. The ancestral state included strips that were few in number, flat, and fused. The strips became S-shaped and disjoined in the lineage leading to most euglenid taxa. These strips became secondarily flattened and fused in one lineage. In some lineages of phototrophs, the strips became increasingly robust. Two strips of different morphology formed the repeating pellicular unit or doublet in four taxa. These doublets evolved convergently at least three times and may provide insights into developmental patterns of the cytoskeleton.

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Section: Resultsmentioning

confidence: 99%

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Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure

Leander

Farmer

2001

J Eukaryotic Microbiology

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“…Although it is the denning apomorphy of the Euglenida, the pellicle has only rarely been systematically examined in detail (e.g. Angeler, Mülliner, and Schagerl 1999; Buetow 1968; Cann 1986; Conforti and Tell 1989; Dragos, Péterfi, and Popescu 1997; Leedale and Hibberd 1974). The general objectives of both this paper and a forthcoming paper dealing with the diversity of strip substructure are (1) to outline macroevolutionary patterns of characters associated with the euglenid pellicle in order (2) to facilitate an accurate interpretation and classification of euglenid phylogeny.…”

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confidence: 99%

“…As a source of possible confusion, some authors have used “muciferous body” to refer to the tubular cisternae of endoplasmic reticulum (ER) associated with each pellicle strip (e.g. Buetow 1968; Leedale 1967; Leedale, Meeuse, and Pringsheim 1965; Dragos, Péterfi, and Popescu 1997). These cisternae of ER and the mucus‐secreting bodies examined in this paper are clearly separate compartments containing different substances (e.g.…”

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Comparative Morphology of the Euglenid Pellicle. I. Patterns of Strips and Pores

Leander

Farmer

2000

J Eukaryotic Microbiology

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In anticipation that improved knowledge of euglenid morphology will provide robust apomorphy-based definitions for clades, transmission and scanning electron microscopy were used to reveal novel morphological patterns associated with the euglenid pellicle. In some taxa, the number of pellicle strips around the cell periphery reduces as discrete whorls at the anterior and posterior ends of the cell. The number of whorls at either end varies between selected euglenid taxa but is invariant within a taxon. The pattern of strip reduction associated with these whorls is shown to have at least three evolutionarily linked states: exponential, pseudoexponential, and linear. Two general equations describe these states near the posterior end of euglenid cells. Exponential patterns of strip reduction near the anterior end are described by a third equation. In addition, several euglenid taxa were found to possess conspicuous pellicle pores. These pores are arranged in discrete rows that follow the articulation zones between adjacent strips. The number of strips between rows of pores varies between taxa and displays a series of consecutive character states that differ by a power of two. The patterns of pores may not only have phylogenetical and taxonomical value but may provide morphological markers for following strip maturation during cytoskeletal reproduction.

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Macroevolution of complex cytoskeletal systems in euglenids

2007

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SummaryEuglenids comprise a group of single-celled eukaryotes with diverse modes of nutrition, including phagotrophy and photosynthesis. The level of morphological diversity present in this group provides an excellent system for demonstrating evolutionary transformations in morphological characters. This diversity also provides compelling evidence for major events in eukaryote evolution, such as the punctuated effects of secondary endosymbiosis and mutations in underlying developmental mechanisms. In this essay, we synthesize evidence for the origin, adaptive significance and diversification of the euglenid cytoskeleton, especially pellicle ultrastructure, pellicle surface patterns, pellicle strip number and the feeding apparatus. We also highlight holes in our knowledge that must be filled before we are able to confidently describe euglenid cell biology and infer the earliest stages in euglenid evolution. Nonetheless, by possessing combinations of characters resulting from adaptive change and morphostasis, euglenids have retained key pieces of evidence necessary for reconstructing the early evolution and diversification of eukaryotic life.

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Comparative fine structure of pellicular cytoskeleton in EuglenaEhrenberg

Cited by 15 publications

References 16 publications

Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure

Comparative Morphology of the Euglenid Pellicle. II. Diversity of Strip Substructure

Comparative Morphology of the Euglenid Pellicle. I. Patterns of Strips and Pores

Macroevolution of complex cytoskeletal systems in euglenids

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