The new classChlamydophyceae, a natural group of the Green Algae (Chlorophyta)

Ettl, H.

doi:10.1007/bf00983209

Cited by 35 publications

(16 citation statements)

References 36 publications

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“…Rather, the concepts of the separate classes Chlamydophyceae and Chlorophyceae, as proposed by Ettl (1981) and here adopted with shght modification, are confirmed by Hori's results.…”

Section: Macromolecular Evidencesupporting

confidence: 69%

“…Eyden, 1975;Hyams & Chasey, 1974;Lembi, 1975;Katz & McLean, 1979;Melkonian & Preisig, 1984). This flagellate cell type is considered characteristic of the Chlamydophyceae, a class of free living green flagellates (Ettl, 1981;Ettl & Komhrek, 1982), and of the reproductive zoids in the class Chiorophyceae s.s. In contrast to Ettl (198I, 1983), we also include "naked" relatives of Chlamydomonas such as Dunafiella in the Chlamydophyceae.…”

Section: Architecture Of the Flageflate Cellmentioning

confidence: 99%

“…In most recently proposed phylogenies (Deason, 1984;Hoops et al, 1982;Mattox & Stewart, 1984;Melkonian, 1982;Sluiman, 1985b;Sluiman et al, 1980a) the Chlamydophyceae (proposed by Ettl, 1981, and here adopted in a slightly different sense) are included in the Chlorophyceae because of the similarity in flagellate cell architecture. This is, however, not consistent with the basic hypothesis that flagellates are primitive with regard to multicellular and siphonous algae.…”

mentioning

confidence: 99%

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The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Hoek

Stam

Olsen

1988

Helgolander Meeresunters

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In traditional chlorophytan systems the organizational level was the primary character for the distinction of main groups (classes and orders). For instance, in Fott (1971), the flagellate level corresponds with the Volvocales, the coccoid level with the Chlorococcales, the filamentous level with the Ulotrichales, the siphonocladous level with the Siphonocladales, and the siphonous level with the Bryopsidales. The new system presented here is an elaboration and emendation of recently proposed taxonomies and their underlying phylogenetic hypotheses, and it is mainly based on ultrastructural features which have become available over the last 15 years. The following criteria are used for the distinction of classes and orders: (1) architecture of the flagellate cell (flagellate cells are considered as the depositories of primitive characters); (2) type of mitosis-cytokinesis; (3) place of meiosis in the life history and, consequently, the sexual hfe history type; (4) organizational level and thallus architecture; (5) habitat type (marine versus feshwater and terrestrial); (6) chloroplast type.

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“…Rather, the concepts of the separate classes Chlamydophyceae and Chlorophyceae, as proposed by Ettl (1981) and here adopted with shght modification, are confirmed by Hori's results.…”

Section: Macromolecular Evidencesupporting

confidence: 69%

Section: Architecture Of the Flageflate Cellmentioning

confidence: 99%

mentioning

confidence: 99%

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The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Hoek

Stam

Olsen

1988

Helgolander Meeresunters

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“…However, careful examination has shown that Dunaliella exhibits an extracellular, wall-like layer mains unresolved. (Oliveira et al, 1980, Melkonian andPreisig, 1984). Chlorococcum and the class Chlamydophyceae.…”

Section: Figmentioning

confidence: 98%

“…Like Chlorococcum, Dunaliella has been the subject of Both molecular data sets include sequences from two debate regarding its phylogenetic position. Ettl (1981, members of the genus Chlorococcum, Clc. novae-1983 considered the absence of a typical cell wall as angliae (originally identified as Chlamydomonas sp.…”

Section: Figmentioning

confidence: 99%

Phylogeny of the Chlamydomonadales (Chlorophyceae): A Comparison of Ribosomal RNA Gene Sequences from the Nucleus and the Chloroplast

Buchheim

Lemieux

Otis

et al. 1996

Molecular Phylogenetics and Evolution

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Ultrastructure of Cephaleuros Virescens (Chroolepidaceae; Chlorophyta). Iv. Absolute Configuration Analysis of the Cruciate Flagellar Apparatus and Multilayered Structures in the Pre‐ and Post‐release Gametes

Chapman

Henk

1983

American J of Botany

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Transmission electron microscopy of pre‐release and post‐release biflagellate gametes of Cephaleuros virescens has produced comparative data on these cells and on the detailed absolute arrangement of the flagellar apparatus. In all major respects including the presence of two multilayered structures (MLS's) the closely compacted, non‐motile but mature pre‐release gametes are similar to the mature, free swimming post‐release gametes. The elongated shape of the free‐swimming gametes differs from the more compact form of the pre‐release gametes, but does not reflect a major difference in the arrangement of internal components. The flagella are bilaterally keeled and each keel contains a cylindrical element. Each flagellar base is encircled by a densely staining collar of modified plasmalemma at the point of entry into the apical papilla. The equal anterior flagella enter the papilla from opposite sides; their basal bodies are parallel and overlapping. Each terminates in a densely staining terminal cap. No capping plate is present. Each basal body is associated both with a three‐layered MLS, the anterior layer of which becomes a lateral microtubular spline of 2 to 8 microtubules, and with an additional medial compound root of two layers of microtubules (2 over 4 or 5). Both the compound microtubule root and the spline may acquire additional microtubules as they extend distally in close proximity to mitochondria and the plasmalemma. No striated roots, or rhizoplasts, have been observed. Two densely staining plaques are associated with the plasma membrane at specific anterior sites and may be comparable to the presumptive mating structures seen in other green algal motile cells. The reversed bilateral symmetry of the cells produces two possible arrangements of the flagellar apparatus, namely, a 11/5 (or left‐handed) arrangement or a 1/7 (or right‐handed) arrangement. Only 11/5 cells have been found. Despite the presence of distinct multilayered structures, some aspects of the gametes of Cephaleuros quite closely resemble the cruciate motile cells of algae now regarded by some authors as typical of Ulvophyceae, sensu Stewart and Mattox.

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The new classChlamydophyceae, a natural group of the Green Algae (Chlorophyta)

Cited by 35 publications

References 36 publications

The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

The emergence of a new chlorophytan system, and Dr. Kornmann's contribution thereto

Phylogeny of the Chlamydomonadales (Chlorophyceae): A Comparison of Ribosomal RNA Gene Sequences from the Nucleus and the Chloroplast

Ultrastructure of Cephaleuros Virescens (Chroolepidaceae; Chlorophyta). Iv. Absolute Configuration Analysis of the Cruciate Flagellar Apparatus and Multilayered Structures in the Pre‐ and Post‐release Gametes

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