CHROMOSOMAL DATA ON SEVEN SPECIES OF GENUS ORTHETRUM (LIBELLULIDAE ANISOPTERA ODONATA) | BIONATURE

Seven species of the genus Orthetrum, belonging to the Libellulidae family, were studied cytogenetically in the states of North and North-east India. Onthetrum glaucum, Orthetrum pruinosum neglectum, Orthetrum sabina sabina, Orthetrum taeniolatum, and Orthetrum triangulare triangulare are among the species that have diploid numbers of 25 m, which is a characteristic libellulid number. The last two species, Orthetrum iuzonicum and Orthetrum japonicum internum, differ from the others in that they have 2n=23 chromosomes and no m chromosomes. All organisms have a sex determination mechanism of the XO-XX type. For the first time in this genus, variations in chromosome number, total chromosome length (TCL), m: X, and longest autosome: X ratios have been investigated.

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