Achiasmate male meiosis in two Cymatia species (Hemiptera,Heteroptera, Corixidae) |
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| Authors: | Desislava Stoianova Snejana Grozeva Nikolay Simov Valentina Kuznetsova |
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| Institution: | 1.Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel, Sofia 1000, Bulgaria;2.National museum of Natural History, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel, Sofia 1000, Bulgaria;3.Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, St. Petersburg 199034, Russia |
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| Abstract: | The karyotype and male meiosis, with a particular focus on the presence or absence of chiasmata between the homologs, were studied in the water boatman species Cymatia
rogenhoferi (Fieber) and Cymatia
coleoptrata (Fabricius) (Corixidae, Cymatiainae). It is shown that the species have 2n = 33 (28A+2m+X1X2Y) and 2n = 24 (20A+2m+XY) respectively, post-reduction of sex chromosomes, and achiasmate meiosis of an alignment type in males. Cytogenetic and some morphological diagnostic characters separating Cymatia Flor from the rest of Corixidae are discussed. |
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| Keywords: | Karyotype m-chromosomes sex chromosome post-reduction spermatocyte meiosis morphology Nepomorpha" target="_blank">Nepomorpha Corixoidea" target="_blank">Corixoidea |
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