Ultrastructure and taxonomy of<i>Actinomonas pusilla</i>, a heterotrophic member of the Pedinellales (Chrysophyceae)

Larsen, Jacob

doi:10.1080/00071618500650351

Cited by 36 publications

(19 citation statements)

References 21 publications

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“…Whereas interconnections between neighbouring triads (at the anterior cell-end) is well documented from the heterotrophic pedinellids (Actinomonas pusilta; Larsen, 1985; Pteridomonas danica; Patterson & Fenchel, 1985), a similar development of the cytoskeleton has not previously been observed in any of the autotrophic forms.…”

Section: Morphologymentioning

confidence: 96%

“…Small struts from the nuclear envelope presumably secure the triads in position. All observed triads terminate inside the cell, a short distance from the plasma membrane where they are interconnected by cytoskeletal elements, which also apparently form collars around each triad (Figs 17, 18) (see Actinomonas pusilla; Larsen, 1985). Several triads can be located in any anterior transverse section (Figs 14-16; encircled in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…23, arrows). Larsen (1985) reports 30 nm in Actinomonas pusilla. Tripartite flagellar hairs are shown in Figs 5, 6, 22.…”

Section: Methodsmentioning

confidence: 99%

“…Apart from this centrally located triad of microtubules, no other triads have been detected in the posterior end of the cell. Several of the outbulging vacuolar surfaces are coated with minute bars (see also Zimmermann et al, 1984;Larsen, 1985).…”

Section: Methodsmentioning

confidence: 99%

“…22; all figures). the concentric rings seen in Actinomonas pusilla (Larsen, 1985) and Pteridomonas danica (Patterson & Fenchel, 1985)]. …”

Section: Methodsmentioning

confidence: 99%

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Ultrastructural studies of the flagellate and cyst stages ofPseudopedinella tricostata(Pedinellales, Chrysophyceae)

Thomsen

1988

British Phycological Journal

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Section: Morphologymentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

“…23, arrows). Larsen (1985) reports 30 nm in Actinomonas pusilla. Tripartite flagellar hairs are shown in Figs 5, 6, 22.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…22; all figures). the concentric rings seen in Actinomonas pusilla (Larsen, 1985) and Pteridomonas danica (Patterson & Fenchel, 1985)]. …”

Section: Methodsmentioning

confidence: 99%

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Ultrastructural studies of the flagellate and cyst stages ofPseudopedinella tricostata(Pedinellales, Chrysophyceae)

Thomsen

1988

British Phycological Journal

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Prey capture in protists utilizing microtubule filled processes and surface motility

Bloodgood

2020

Cytoskeleton

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Surface motility, which can be visualized by the movement of live prey organisms, polystyrene microspheres or other inert particles, has been shown to occur in a wide variety of microtubule-filled extensions of the protistan cell surface, although the associated functions remain enigmatic. This article integrates an extensive but poorly known body of literature showing that surface motility, associated with microtubulefilled cell extensions such as flagella, axopodia, actinopodia, reticulopodia, and haptonema, plays a crucial role in protistan prey capture. Surface motility has been most extensively studied in Chlamydomonas where it is responsible for flagelladependent whole cell gliding motility. The force transduction machinery for gliding motility in Chlamydomonas is intraflagellar transport. Other than in Chlamydomonas, this field has not moved far beyond the descriptive to the mechanistic because of technical challenges associated with many of the protistan organisms that utilize surface motility for prey capture. The purpose of this article is to rekindle interest in the protistan systems that utilize surface motility for prey capture at a time when newly emerging molecular tools for working with protists are poised to reinvigorate a field that has been quiescent too long.

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Synurophyceae Classis Nov., a New Class of Algae

Andersen

1987

American J of Botany

118

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The silica‐scaled algae (Synuraceae, Chrysophyceae sensu lato) are compared to other Chrysophyceae, Phaeophyceae and Bacillariophyceae with occasional comparisons to other chlorophyll c‐containing algae, scaled protozoa and oomycete fungi. The silica‐scaled algae have several unique characters which separate them from the above groups and based upon these differences a new order, Synurales ord. nov., and a new class, Synurophyceae class. nov., are described. The major distinguishing characters of the Synurophyceae class. nov. are: they have chlorophylls a and c1 but lack chlorophyll c2; their flagellar apparatus includes a microtubular root that loops around two parallel flagella and a flagellar root system which occurs in four absolute orientations; the photoreceptor consists of paired flagellar swellings which are not associated with the cell membrane and chloroplast; no eyespot is present; the nuclear envelope is not or is only weakly associated with the chloroplast endoplasmic reticulum. The Synurophyceae class. nov. are about equally distinct from the Chrysophyceae sensu stricto, Phaeophyceae and Bacillariophyceae when the class level characters are compared. Although the Phaeophyceae have a long history of being placed by themselves in the division Phaeophyta, and the Bacillariophyceae and Chrysophyceae have recently been placed alone in the Bacillariophyta and Chrysophyta, respectively, the similarities found among these classes suggest these algae are not so distinct that they require separate divisions. Tentatively, therefore, the Synurophyceae are placed in the division Phaeophyta along with the Bacillariophyceae and Chrysophyceae sensu stricto.

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Ultrastructure and taxonomy ofActinomonas pusilla, a heterotrophic member of the Pedinellales (Chrysophyceae)

Cited by 36 publications

References 21 publications

Ultrastructural studies of the flagellate and cyst stages ofPseudopedinella tricostata(Pedinellales, Chrysophyceae)

Ultrastructural studies of the flagellate and cyst stages ofPseudopedinella tricostata(Pedinellales, Chrysophyceae)

Prey capture in protists utilizing microtubule filled processes and surface motility

Synurophyceae Classis Nov., a New Class of Algae

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