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  • Articles  (6)
  • taxonomy
  • Springer  (6)
  • American Chemical Society (ACS)
  • Wiley-Blackwell
  • 2020-2024
  • 2015-2019
  • 2005-2009
  • 1990-1994
  • 1980-1984  (6)
  • 1980  (6)
  • Biology  (6)
Collection
  • Articles  (6)
Source
Keywords
Publisher
  • Springer  (6)
  • American Chemical Society (ACS)
  • Wiley-Blackwell
Years
  • 2020-2024
  • 2015-2019
  • 2005-2009
  • 1990-1994
  • 1980-1984  (6)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Neue Beobachtungen zur Morphologie des Zapfens vonPinus und ihre Bedeutung für die Systematik, Fossil-bestimmung, Arealgestaltung und Evolution der Gattung (1980)
    Springer
    Plant systematics and evolution 134 (1980), S. 137-171 
    Details
    ISSN: 1615-6110
    Keywords: Pinaceae ; Pinus ; Palaeobotany ; cone morphology ; apophysis characters ; shape and position of umbo and mucro ; taxonomy ; evolution ; distribution pattern and fossils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new approach to the classification ofPinus based on analyses of umbo and mucro on the cone scales is presented. It matches the basic frame of existing classification systems and allows determination of sections or even species. In particular, the subdivision ofDiploxylon pines into groups with centric or excentric mucro separates most Eurasian from American species. Fossils with well preserved mucro now can be grouped better and determined with more accuracy. Furthermore, umbo analyses which consider the ontogeny of the conelets and the shift from primitive to derived character states from the apex to the basis of mature cones lead to an additional evaluation of relationships and evolutionary lines among pines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986796
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  • 2
    Electronic Resource
    Electronic Resource
    Morphological and cytological investigations ofUlothrix zonata and taxonomy of the related species (1980)
    Springer
    Plant systematics and evolution 135 (1980), S. 151-158 
    Details
    ISSN: 1615-6110
    Keywords: Ulothrix ; Ulotrichales ; Ohlorophyceae ; Morphology ; reproduction ; cytology ; polymorphism ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present communication deals with the observations made on the morphology, reproduction and cytology ofUlothrix zonata (Weber & Mohr)Kütz. in culture. The alga displays a remarkable phenotypic plasticity in nature as well as in culture. The present study provides additional evidence of karyology in support ofLokhorst andVroman's treatment ofU. zonata which merges a number of earlier described species in it. The cytological details and chromosome number (n = 10) determined for the Indian isolates ofU. zonata agree with those ofSarma for the British material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983183
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  • 3
    Electronic Resource
    Electronic Resource
    Workshop on taxonomy and biogeography (1980)
    Springer
    Hydrobiologia 73 (1980), S. 205-206 
    Details
    ISSN: 1573-5117
    Keywords: species concept ; taxonomy ; global distribution ; passive dispersal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019448
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  • 4
    Electronic Resource
    Electronic Resource
    On morphological variation in Keratella cochlearis populations from Holstein lakes (Northern Germany) (1980)
    Springer
    Hydrobiologia 73 (1980), S. 255-258 
    Details
    ISSN: 1573-5117
    Keywords: Keratella cochlearis (Rotatoria) ; morphological variation ; taxonomy ; Lauterborn cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Keratella cochlearis occurs in many Holstein lakes (northern Germany) as three well defined and separated forms: ‘cochlearis’, ‘hispida’, and ‘tecta’, each showing very little variation between the lakes. The present data show that the ‘tecta’ form did not originate from a Lauterborn cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019456
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  • 5
    Electronic Resource
    Electronic Resource
    Synopsis of taxonomic studies on Indian rotatoria (1980)
    Springer
    Hydrobiologia 73 (1980), S. 229-236 
    Details
    ISSN: 1573-5117
    Keywords: taxonomy ; India ; Rotatoria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Taxonomic studies of Indian rotifers have revealed the presence of 241 species which are listed in an appendix. The nature of the Indian rotifer fauna is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019452
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  • 6
    Electronic Resource
    Electronic Resource
    On the evolutionary pathways of speciation in the genus Notholca (1980)
    Springer
    Hydrobiologia 73 (1980), S. 215-220 
    Details
    ISSN: 1573-5117
    Keywords: Rotatoria ; taxonomy ; geographical distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An attempt is undertaken to determine criteria and limits of taxonomic rank in the genus Notholca proceeding from the standpoint of level-values of the characters evolution. Level-values of characters were established using Vavilov's principle of homologic series of hereditary variability. As a result of taxonomic revision such terms as group of species, species and subspecies are recommended. Analysis of the scheme of relations between representatives of the genus and data on their ranges gives a clue to relations between phylogeny and geographic distribution of the group over the vast territory of the Asian continent which may have been its centre of speciation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019450
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