Cytogenetics of Adamanotus uncotibialis Jacobs (Heteroptera: Aradidae)

Abstract

The cytogenetics of Adamanotus uncotibialis (Aradidae, Carventinae) with a chromosome number of 2n=16XY is described and figured. An idiogram of the karyotype, based on chromosome area measurements by means of an image analyzer, is presented and the method, its advantages and limitations is described and discussed. A chiasma analysis of seven individuals is given and briefly discussed. The occurrence of abnormal meiocytes (including malorientated chromosomes and bivalents at metaphase I and II, laggards and late segregating chromosomes at anaphase I and II, chromatid bridges at anaphase II and tetraploid and unbalanced metaphase II cells) at a low frequency is reported and it is suggested that they originate because of dicentric spindle attachment of the chromosomes.

Key words:

• abnormal meiocytes
• Aradidae
• cytogenetics
• Heteroptera
• holocentic chromosomes
• idiogram
• karyotype
• meiosis