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  • 1
    Digitale Medien
    Digitale Medien
    The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists (2005)
    Malden, USA : Blackwell Publishing Inc
    The @journal of eukaryotic microbiology 52 (2005), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract. This revision of the classification of unicellular eukaryotes updates that of Levine et al. (1980) for the protozoa and expands it to include other protists. Whereas the previous revision was primarily to incorporate the results of ultrastructural studies, this revision incorporates results from both ultrastructural research since 1980 and molecular phylogenetic studies. We propose a scheme that is based on nameless ranked systematics. The vocabulary of the taxonomy is updated, particularly to clarify the naming of groups that have been repositioned. We recognize six clusters of eukaryotes that may represent the basic groupings similar to traditional “kingdoms.” The multicellular lineages emerged from within monophyletic protist lineages: animals and fungi from Opisthokonta, plants from Archaeplastida, and brown algae from Stramenopiles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.2005.00053.x
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  • 2
    Digitale Medien
    Digitale Medien
    Auxospore formation inLicmophora (Bacillariophyta) (1982)
    Springer
    Plant systematics and evolution 139 (1982), S. 289-294 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Bacillariophyta ; Pennatae ; Fragilariaceae ; Licmophora gracilis var.anglica ; Auxospore formation ; taxonomy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract InLicmophora gracilis var.anglica two auxospores are produced per pair of mother-cells, through the allogamic fusion of migratory and stationary gametes. Both active gametes are produced from the same mother-cell and hence both zygotes are formed in the other mother-cell. Pairing can occur between two stalked cells, or between a stalked cell and a detached cell; in the latter case the migratory gametes derive from the detached cell. The auxospores expand parallel to one another and to the apical axis of the donor mother-cell. Behavioural anisogamy of this kind, which may be termed thecis-type, seems to be characteristic of most araphid pennates and contrasts with thetrans-type exhibited byCymbella, Gomphonema and some other raphid taxa, where each mother-cell produces one migratory and one stationary gamete.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00989331
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  • 3
    Digitale Medien
    Digitale Medien
    The use of the central raphe endings as a taxonomic character (1982)
    Springer
    Plant systematics and evolution 141 (1982), S. 143-152 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Bacillariophyta ; Bacillariaceae ; Nitzschia ; Raphe Structure ; Systematics ; Evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The use of the central raphe endings as a key character in the classification ofNitzschia is argued to be of doubtful validity. Some aspects of the evolution of the raphe are discussed in relation to variation in raphe structure within fibulate genera.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00986414
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  • 4
    Digitale Medien
    Digitale Medien
    On auxospore formation inCaloneis and the nature ofAmphiraphia (Bacillariophyta) (1989)
    Springer
    Plant systematics and evolution 163 (1989), S. 43-52 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Diatoms ; Amphiraphia ; Amphiraphidales ; Caloneis ; Auxospore formation ; initial cell structure ; perizonium structure ; sexual reproduction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Amphiraphia Chen & Zhu, together with theAmphiraphiaceae andAmphiraphidales, should be abandoned, sinceAmphiraphia cells are the heterovalvar initial cells ofCaloneis. WhenCaloneis reproduces sexually two cells pair and become surrounded by a two-layered capsule of mucilage. Each cell produces two gametes and these become rearranged within the gametangial frustule before plasmogamy. The gametes are amoeboid and fusion is isogamous. Following plasmogamy the zygote contracts, becomes ellipsoidal, and lays down a primary perizonial band. This is a complete, wide hoop, while subsequent perizonial bands are narrow and open.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00936152
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  • 5
    Digitale Medien
    Digitale Medien
    The species concept in diatoms: Evidence for morphologically distinct, sympatric gamodemes in four epipelic species (1989)
    Springer
    Plant systematics and evolution 164 (1989), S. 215-237 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Diatoms ; Caloneis ; Cymatopleura ; Neidium ; Sellaphora ; Infraspecific variation ; microevolution ; reproductive isolation ; species concepts
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Reproductive isolation is demonstrated between morphologically distinct, sympatric demes of four epipelic diatom species inhabiting a small pond. The six demes ofSellaphora pupula, four of them allogamous, one probably autogamous, and one apparently asexual, differ morphologically with respect to size, shape, stria density and pattern. In the pond,Caloneis silicula, Cymatopleura solea, andNeidium ampliatum each contain two allogamous demes, differing principally in size. There are intrinsic barriers to hybridization between the demes, which operate at the earliest stages of sexual reproduction. Such gamodemes are perhaps best treated taxonomically as separate species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00940439
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