Detailed karyotype information (the number, shape, C-bands, NORs, and chiasmata) of Tachycines coreanus Yamasaki, 1969 from South Korea is given for the first time. The karyotype of this species with 2n male=49 (XO) possesses all acrocentric chromosomes.
Tettigonia ussuriana and T. dolichopoda maritima differ in the length of tegmina, details in venation, and in females in details of the subgenital plate. The two species of the genus Tettigonia have the same number and morphology of autosomes but a different morphology of the X chromosome: in T. ussuriana it is metacentric, whereas in T. dolichopoda maritima acrocentric. In both species, euchromatic zones and breaks of one or to chromatids during meiosis and mitosis in theXchromosome were observed. Additionally, B chromosomes were noted in most individuals of both species.
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