, Volume 32, Issue 3, pp 332–342 | Cite as

Oogenesis and chromosomal heterozygosity in the thelytokous midge, Lundstroemia parthenogenetica (Diptera, Chironomidae)

  • D. L. Porter


The thelytokous triploid midge Lundstroemia parthenogenetica (Diptera: Chironomidae:Chironominae), 3n = 9, is always found to be heterozygous for two inversions and a deletion. Parthenogenesis is maintained by an apomiotic restitutional oogenesis as found in the subfamily Orthocladiinae. This mechanism is compared with other groups exhibiting a restitutional or disordered first division. Possible modes of evolution of the apomictic restitutional system, origin of triploidy in apomictic forms, and chromosomal polymorphisms are discussed.


Developmental Biology Chromosomal Polymorphism Apomictic Form Chromosomal Heterozygosity 
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© Springer-Verlag 1971

Authors and Affiliations

  • D. L. Porter
    • 1
  1. 1.Department of GeneticsUniversity of MelbourneAustralia

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