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Variation in size of the dragonefly m-chromosome, with considerations on its significance for the chorogeography and taxonomy of the order odonata, and notes on the validity of the rule of reinig

Genetica, ISSN: 0016-6707, Vol: 39, Issue: 1, Page: 64-74
1968
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  • Citations
    14
    • Citation Indexes
      14
  • Captures
    1

Article Description

The morphological and kinetical features of the so-called m-chromosomes in dragonflies are reviewed. The relative size of the m-chromosomes varies in some species, but not in all. It has been demonstrated that the size is peculiar, in some dragonflies, for populations originating from different portions of the species range, and therefore it could be used to advantage in the taxonomy of infraspecific forms. The dragonfly m-chromosomes are considered as fragments of normal autosomes. The break can take place at any time, at any place in the holokinetic chromosome, and in any geographic population, therefore the variation in size of the m-chromosome is only accidental and has no chorogeographic implications. The chorogeographic hypothesis of Reinig (1938, 1939), which has been widely promoted by some distinguished odonatologists, has no connection with the size trend of the m-chromosomes. Its general validity for the determination of the body size of dragonflies is likewise rejected. © 1968 Martinus Nijhoff.

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