Short Communication |
Corresponding author: Ilya Gavrilov-Zimin ( coccids@gmail.com ) Academic editor: Valentina G. Kuznetsova
© 2017 Ilya Gavrilov-Zimin.
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Citation:
Gavrilov-Zimin I (2017) Contribution to the cytogenetics of Kuwaniini scale insects (Homoptera, Coccinea, Margarodidae s.l.). Comparative Cytogenetics 11(4): 659-663. https://doi.org/10.3897/CompCytogen.v11i4.20168
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Jansenus burgeri Foldi, 1997 (Margarodidae s.l., Xylococcinae, Kuwaniini) was studied cytogenetically for the first time. It was shown that the species reproduces bisexually, displays XX/X(0) sex chromosome system and 2n=6/5 (female/male) including two pairs of long autosomes and a pair of shorter X-chromosomes in female. The chromosome complement, adult female morphology and the life cycle of J. burgeri are illustrated. The cytogenetic data are in fact the first ones for Kuwaniini scale insects, because Kuwania oligostigma De Lotto, 1959 briefly cytogenetically studied by
Jansenus burgeri , scale insects, morphology, life cycle, karyotype, sex chromosome system
The tribe Kuwaniini MacGillivray, 1921 (Margarodidae s.l., Xylococcinae), which currently comprises four nominal genera (Wu and Nan
The exact type locality (in Thailand) for Jansenus burgeri was unknown and there have been no reports on new findings of this species since its original description. In June 2017 I was able to collect fresh material on this species during my expedition in Northern Laos (bank of Mekong, Pak Beng village, on stem under the bark of undetermined tree, adult females and larvae, guarded by ants, 14.VI.2017, I. Gavrilov-Zimin, collection number K 1385, preserved at Zoological Institute, Russian Academy of Sciences). The material was suitable both for morphological investigation (Fig.
Only a few species of Xylococcinae have been studied cytogenetically till now and all available data were published without photographs of the chromosomes. Thus, Kuwania oligostigma De Lotto, 1959 (tribe Kuwaniini) shows 2n=16 in adult female and bisexual reproduction (
Embryonic cells of Jansenus burgeri Foldi, 1997 in female (2n=6) and male (2n=5) embryos; sex chromosomes are arrowed.
The life cycle of Jansenus burgeri Foldi, 1997; L1–L3 – first, second and third larval stages; N1 – nymphal (preimaginal) stage with protoptera (wing buds) of male.
Matsucoccus gallicolus Morrison, 1939 (Xylococcinae, Matsucoccini) was studied by
Thus, amongst the four Xylococcinae species studied so far, Jansenus burgeri shows the lowest chromosome number, 2n=6. Of the other scale insects, the same number is known only in few species of the subfamily Monophlebinae (Orthezioidea, Margarodidae s.l.) and in some species of neococcids (superfamily Coccoidea) – see for review
The work was performed in the context of the state research projects no. 01201351189 and AAAA-A17-117030310018-5 in the Zoological Institute of the Russian Academy of Sciences. The expedition expenses (in Laos) were partly covered by a personal travel grant from the Percy Sladen Memorial Fund (U.K.).