Abstract
More than 80'% of the taxonomically described species of Anisoptera (Odonata) belong to the families Libellulidae and Aeshnidae. Here the chromosome complement and male meiotic behaviour of seven species of dragonflies of these families are analyzed. Antrx tmiuz nd Coryphuc~si,hnci pcrrc~nsi are 2n = 27, n = 13 + X, which is characteristic of Aeshnidae. Within Libellulidae, Plutiiplus eryrhropygu, Micrutlzyriu .spur.itr and M. /ic,qwris have 2n = 25, n = 12 + X, which corresponds to the modal chromosome number of the family. Oli&udu hetititi and M. ungulrtu, on the other hand, have a reduced chromosome complement (n = I1 + X and 11 = 10 + X,XzY, respectively). In Micruthyriu ttngulutu an X,X,Y sex chromosome system is described, and its origin is discussed. This represents a new sex chromosome determining system in the order Odonata.
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