Meiotic karyotypes and structure of testes in males of 17 species of Psyllidae: Spondyliaspidinae (Hemiptera: Psylloidea) from Australia

Abstract

Chromosome numbers and sex‐determining systems of 16 species in 10 genera of Australian Psyllidae: Spondyliaspidinae (Hemiptera: Psylloidea) are presented. This is the first comprehensive karyological study for the Spondyliaspidinae. Karyotypes were: 2n = 11 (10 + X) for males of Australopsylla sp., Boreioglycaspis melaleucae (Moore), Cardiaspina albitextura Taylor, Creiis sp., Platyobria lewisi Taylor and Spondyliaspis plicatuloides (Froggatt); 2n = 9 (8 + X) for Blastopsylla adnatariae Taylor, Blastopsylla moorei Taylor, Cardiaspina retator Taylor, Cryptoneossa sp. (near triangula Taylor), Glycaspis brimblecombei Moore; and 2n = 7 (6 + X) for Anoeconeossa communis Taylor, Anoeconeossa sp. (communis group), Anoeconeossa sp. (fuscipennis group), A. unicornuta Taylor and Creiis vulgaris Taylor. The chromosome number 2n = 7 is the lowest recorded for any Psylloidea. The number of testicular follicles and arrangement of spermatocyte cysts (spermatocysts) in the follicles of each species, and of an additional species, Ctenarytaina sp. are described. Aspects of the karyology and morphology of the male reproductive system of each of the 17 species in 11 genera of Spondyliaspidinae are discussed in terms of recent shifts in spondyliaspidine classification and of the phylogenetic position of the Spondyliaspidinae within the Psylloidea.

Meiotic karyotypes and structure of testes in males of 12 species of Psyllidae: Acizziinae, Carsidaridae and Triozidae (Hemiptera: Psylloidea) from Australia

“…The present study, together with the recent work on the predominantly Australian Psyllidae: Spondyliaspidinae (Maryańska‐Nadachowska et al 2001), represents the only comprehensive karyological studies and descriptions of the male internal reproductive system for the Australian Psylloidea.…”

“…Głowacka and Klimaszewski (1968, 1970) suggested that evolutionary changes of the anatomical structures have occurred at a lower rate compared with changes to external morphological characters. The male internal reproductive system was shown to be less differentiated than some external characters, and may be useful in systematic studies to construct relationships for the Psylloidea worldwide (Głowacka et al 1995; Kuznetsova et al 1995; Matcharashvili & Kuznetsova 1997; Maryańska‐Nadachowska et al 2001).…”

“…Morphology of the male internal reproductive system, including number of testicular follicles and the arrangement of spermatocysts within a follicle, was examined using the technique described in Maryańska‐Nadachowska et al (2001).…”

“…The karyology of some 125 species from 51 psylloid genera and the structure of the male internal reproductive organs of 182 species from 60 psylloid genera have been studied (Maryańska‐Nadachowska et al 1992, 2001; Głowacka et al 1995; Kuznetsova et al 1997a; Matcharashvili & Kuznetsova 1997). Chromosome numbers and the number of testicular follicles and arrangement of spermatocysts within a follicle were found to be of taxonomic and phylogenetic significance.…”

“…Recently the karyotypes of 16 species, and the internal reproductive system of 17 species of Australian Psyllidae: Spondyliaspidinae (Hemiptera: Psylloidea) have been investigated (Maryańska‐Nadachowska et al 2001), representing the first comprehensive study of this kind, not only for the subfamily, but for the Australian region as well. All species displayed unusually low chromosome numbers of 2n = 11, 9 and 7 in males, the latter two being the lowest chromosome numbers recorded for any Psylloidea.…”