Contribution to the cytogenetics of Kuwaniini scale insects (Homoptera, Coccinea, Margarodidae s.l.).

Ilya Gavrilov-Zimin

doi:10.3897/compcytogen.v11i4.20168

Abstract

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 Hughes-Schrader (1963), in my opinion, may be excluded from the genus Kuwania Cockerell, 1903 and the tribe Kuwaniini, since this species shows aberrant morphological characters, specifically the total absence of abdominal spiracles and the presence of tubular ducts.

Highlights

In 1997 Dr Imre Foldi described from Thailand a peculiar new species and new monotypic genus, Jansenus burgeri Foldi, 1997, placed by him in the subfamily Xylococcinae without tribal attribution
Wu and Nan (2012) considered this genus as closely related to Kuwania, Neogreenia and Neosteingelia, and that conforms to my own view on the taxonomy of this group
The exact type locality for Jansenus burgeri was unknown and there have been no reports on new findings of this species since its original description

Summary

Introduction

Keywords 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 2012), has not been explored cytogenetically up to the present excluding the brief note (without photographs) of HughesSchrader (1963) on chromosomal number (2n=16) in Kuwania oligostigma De Lotto, 1959, whose taxonomic position is questionable (see below). Two other genera of the tribe, Neogreenia MacGillivray, 1921 and monotypic Neosteingelia Morrison, 1927, have never been studied in terms of cytogenetics and reproductive biology.

Results

Conclusion