Homoeocerini

Bansal, Nidhi & Kaur, Harbhajan, 2013, Karyological and meiotic studies in seven species of Coreinae (Hemiptera: Heteroptera: Coreidae) from North India, Zootaxa 3641 (5), pp. 577-586 : 583-584

Homoeocerini

Homoeocerini is represented by 12 genera (Schuh & Slater 1995), all found in the Eastern Hemisphere. Cytologically, only 2 genera have been investigated, Homoeocerus (16 species) and Anacanthocoris (1 species). In the present study, the chromosome complement of Homoeocerus macula is described. In Homoeocerus macula , 2n is 21 with 18 autosomes, 2 microchromosomes and X0 sex mechanism ( Fig. 24 ). A similar complement has been observed in 11 other species of Homoeocerus (Toshioka 1934, 1935; Dutt 1957; Parshad 1957a, b; Manna & Deb Mallick 1981; Sands 1982; Takenouchi & Muramoto, 1967; Yang et al. 2012). Deviations from this number have been recorded in Homoeocerus angulatus with 2n=22=18A+ 2m + X1X2 0, in Homoeocerus limbatipennis with 2n=20=18A+ X1X2 0 (Sands 1982), in Homoeocerus unipunctatus with 2n=19=16A+ 2m +X0 (Toshioka 1935) and in Homoeocerus serrifer with 2n=18=16A+ X1X2 0 (Sands 1982). An autosome number of 18 is quite stable, being present in all excepting Homoeocerus serrifer and Homoeocerus unipunctatus , both of which have 16 autosomes; and Homoeocerus bannaensis which has 14 autosomes. In species of Homoeocerus with 9 pairs of autosomes, distinct size groups are not found. However, in Homoeocerus bannaensis with 7 autosomal pairs, 1 pair of autosomes is extremely large. Microchromosomes are present in all the species except Homoeocerus limbatipennis and Homoeocerus serrifer . In Homoeocerus , X0 is the dominant sex mechanism, present in 13 species; whereas X1X2 0 is present only in 3 species.

Acanthocorini

Acanthocorini is represented by 8 genera, all found in the Eastern Hemisphere (Schuh & Slater 1995). Cytologically, 7 species belonging to 2 genera are known and the diploid number is highly variable ranging from 19 to 26. In Petalocnemis obscura , here studied for the first time, has 2n= 26=22A+ 2m + X1X2 0. The complement is conspicuous by 2 pairs of very small autosomes, 5 pairs of large, 4 pairs of medium autosomes. X1 and X2 are unequal in size ( Fig. 5 ).

Figures

FIGURES 22 – 26. Metaphase I; 22. Anoplocnemis binotata; 23. Ochrochira nigrorufa; 24. Homoeocerus macula; 25. Petalocnemis obscura; 26. Anhomoeus nepalensis. 27 – 29. Metaphase II 27. Anoplocnemis binotata; 28. Cletus borealis; 29. Petalocnemis obscura. Arrows point to microchromosomes. Arrowheads indicate X chromosome. Bar = 10 μm.

FIGURES 1 – 5. Prometaphase with karyotype; 1. Anoplocnemis binotata; 2. Ochrochira nigrorufa; 3. Prionolomia sp.; 4. Cletus borealis; 5. Petalocnemis obscura. Bar = 10 μm.