A survey of chromosome complements in the Tetranychidae

The chromosome number and sex-determination of 15 actinotrichid species belonging to Eriophyidae, Tenuipalpidae, Tetranychidae, Tydeidae and Epidermoptidae were determined. The chromosomes of most species examined are few in number and roughly similar in size, shape and behaviour. It is believed that all species have holokinetic chromosomes. Haplodiploidy was shown to be the mechanism of sex-determination in the Eriophyidae, since all 8 species examined were found to have eggs with n = 2 and 2n = 4 chromosomes. Myialges pari Fain is the first psoroptid species examined on karyotype. The occurrence of eggs with n = 8 and 2n = 16 chromosomes is evidence for the existence of haplo-diploidy in the order of the Psoroptina.

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“…It is to mention that arrhenotoky has also been demonstrated for the Tenuipalpidae and the Tetranychidae Helle et al, 1981).…”

Section: Discussionmentioning

confidence: 92%

“…The Tetranychidae and Tenuipalpidae were rather thoroughly examined on karyotype earlier, and the main facts and conclusions can be found in Helle et al, (1981) and Bolland and Helle (1981). Of Eriophyidae, the gall mites, no species have been karyotyped thus far.…”

Section: Introductionmentioning

confidence: 98%

The chromosomes and sex-determination of some actinotrichid taxa (Acari), with special reference to Eriophyidae

Helle

Wysoki

1983

International Journal of Acarology

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“…The division of these genera into subgeneric groups based on inconsistent morphological differences remains questionable. Helle et al . (1981) suggested that this historic subdivision was for practical rather than phylogenetic reasons and that it resulted in a somewhat artificial classification (Meyer 1987).…”

Section: Oligonychus On Grasses In Australiamentioning

confidence: 99%

Spider mites of sugarcane in Australia: a review of grass‐feedingOligonychusBerlese (Acari: Prostigmata: Tetranychidae)

Beard

Walter

Allsopp

2003

Australian Journal of Entomology

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In many areas of the world, spider mites are significant pests of sugarcane. Australia is currently fortunate in lacking the most destructive species, and usually suffers only sporadic damage. Herein, we provide a key to the genera of spider mites associated with sugarcane, review the most significant genus, Oligonychus Berlese, and provide a key to the species of grass-feeding Oligonychus in the Australasian region. The species O. araneum Davis, O. digitatus Davis, O. grypus Baker and Pritchard, O. orthius Rimando, and O. oryzae (Hirst) are redescribed, while the Australian O. zanclopes sp. n. Beard and Walter from sugarcane and rice, O. turbelli sp. n. Beard and Walter, O. ephamnus sp. n. Beard and Walter and O. festucolus sp. n. Beard and Walter from other grasses, are newly described. Previous records of O. grypus in Australia appear to be misidentifications of what is described here as the new species O. zanclopes .

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“…The species reproduces by arrhenotoky, with diploid females and haploid males (Helle et al, 1981). The lifetime fecundity of females feeding on poinsettia leaves is 21, 51 and 32 eggs and the intrinsic rate of increase is 0.0988, 0.1731 and 0.1145 at 20, 24 and 28 °C, respectively (Lai and Lin, 2005).…”

Section: Reproductionmentioning

confidence: 99%