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Abstract
The Lygaeidae (Heteroptera) are a large and diverse family in which the male diploid chromosomal complement ranges from 10 to 30. Diploid numbers of 14 and 16 are taken as two modal numbers of the family. The Rhyparochrominae, one of the largest subfamilies of the Lygaeidae, are known to be heterogeneous both cytologically and morphologically. Available data on the tribe Rhyparochromini reveal that all species are characterized by the presence of a pair of microchromo- somes (m-chromosomes) and have an XY/XX (♂/♀) sex chromosome determining system. Dieuches coloratus (Distant, 1909) and D. insignis (Distant, 1918) belong- ing to Rhyparochromini, have 2n=14=10A+2m+XY and 2n=12=8A+2m+XY respec- tively. Both the species are similar in having one pair of distinctly large autosomes in their chromosome complements. The metaphase plate arrangement of autosomes, sex chromosomes and m-chromosomes in D. coloratus is similar to the common condi- tion observed in the tribe Rhyparochromini. In D. insignis, however, the arrange- ment is different. Here, metaphase I is usual in showing peripheral position of auto- somes and central position of sex chromosomes and m-chromosomes. At metaphase II, however, autosomes, sex chromosomes and m-chromosomes are peripherally placed, an arrangement, which is not reported earlier in the tribe Rhyparochromini.
Highlights
The Lygaeidae are a large and diverse family of the suborder Heteroptera
Male specimens of Dieuches coloratus were collected using a light trap in the campus area of Punjabi University, Patiala, Punjab, India while those of D. insignis were collected from fallen leaves and underneath wet logs in an abandoned forest in Ropar district of Punjab, India
Multiple sex chromosomes are present in the tribes Beosini and Lethiini (Pfaler-Collander, 1941)
Summary
The Lygaeidae are a large and diverse family of the suborder Heteroptera This taxon was first recognized as a higher group by Schilling (1829), and the first and most complete early synthesis was performed by Stål (1872). It was Slater (1964) who provided a modern world catalogue of the Lygaeidae. Ueshima and Ashlock (1980) and Grozeva and Kuznetsova (1993) provided comprehensive data on the cytotaxonomy of the subfamilies of the Lygaeidae. In the tribe Rhyparochromini, 32 species have been cytologically investigated as per the data compiled by Grozeva and Kuznetsova (1993).
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