http://zoobank.org/urn:lsid:zoobank.org:pub:DD79A12C-68CC-4D69-B20A-9AEFA2A12D38

First record of Megacydnus secundus J. A. Lis, 2002, a representative o

Achiasmate male meiosis in two Cymatia species (Hemiptera, Heteroptera, Corixidae) 95 Achiasmate male meiosis in two Cymatia species

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 C. 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