Coccus viridis (Green, 1889)

Gavrilov-Zimin, Ilya A., 2020, Chromosomal and reproductive features of some Oriental and Australasian scale insects (Homoptera, Coccinea), Comparative Cytogenetics 14 (3), pp. 339-352 : 339

Coccus viridis (Green, 1889) Figs 3a , 4

Material.

K 939, Indonesia, Bali, mountain forest above Lake Buyan, about 1200 m altitude, on leaves of an undetermined tree, 13.XI. 2011, I.A. Gavrilov-Zimin.

New data.

2n = 18; there is no heterochromatinization (and thus no Lecanoid system) in all 50 studied embryos from 3 females, no sperm in spermathecae and no males in the studied population; so, the thelytocous reproduction is characteristic of this species. Complete ovoviviparity. Female reproductive system is of the usual for the soft scales type (Fig. 4 ).

Comments.

The type species of the genus, Coccus hesperidum Linnaeus, 1758, shows 2n =14 and different variants of parthenogenesis ( Thomsen 1927, 1929, Nur 1979), whereas two other studied species, C. longulus (Douglas, 1887) and Coccus sp., were reported by Moharana (1990) as having 2n=18, but without any comments on genetic system and reproductive peculiarities. All other (more than 110) species of the genus Coccus Linnaeus, 1758, are still unstudied cytogenetically.

Figures

Figure 3. Embryonic cells and chromosomes of the studied species (Coccidae). a Coccus viridis (2 n = 18) b Discochiton expansum (2 n = 18) c Luzulaspis australis (2 n = 18) d Megalocryptes buteae (2 n = 18) e Megapulvinaria maxima (2 n = 20) f Saccharolecanium krugeri (2 n = 18). Scale bars: 10 µm.

Figure 4. General anatomy of the female reproductive system in the studied species (Coccidae).