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. 2015 Nov 19:(538):95-104.
doi: 10.3897/zookeys.538.6722. eCollection 2015.

Achiasmate male meiosis in two Cymatia species (Hemiptera, Heteroptera, Corixidae)

Desislava Stoianova  1 , Snejana Grozeva  1 , Nikolay Simov  2 , Valentina Kuznetsova  3
Affiliations

Achiasmate male meiosis in two Cymatia species (Hemiptera, Heteroptera, Corixidae)

Desislava Stoianova et al. Zookeys. .

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.

Keywords: Corixoidea; Karyotype; Nepomorpha; m-chromosomes; morphology; sex chromosome post-reduction; spermatocyte meiosis.

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Figures

Figures 1–7.
Figures 1–7.
Male meiosis in Cymatia species. 1–3 Cymatia rogenhoferi: a–c early condensation stages 2 MI from the pole. The bivalents (consisting of two side-by-side aligned chromosomes facing the opposite poles) and three univalent sex chromosomes (two X and one Y) form a ring, with a pair of very small and negatively heteropycnotic m-chromosomes in its centre 3 MII. The autosomes and m-chromosome form a ring, with pseudo-trivalent of the sex chromosomes in its centre 4–7 Cymatia coleoptrata: a, b early condensation stages 5 MI from the pole. The bivalents (consisting of two side-by-side aligned chromosomes) and two univalent sex chromosomes (X and Y) form a ring, with a pair of very small and negatively heteropycnotic m-chromosomes in its centre 6 MI from the equator.The homologous autosomes can be seen lying parallel 7 late MI and AI plates. Scale bar = 10 µm.
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