1993
DOI: 10.1007/bf00118435
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Discontinuous variation in the suppression of idiosomal setae in the family Phytoseiidae (Acari: Gamasina)

Abstract: Chant, D.A. 1993. Discontinuous variation in the suppression of idiosomal setae in the family Phytoseiidae (Acari: Gamasina). Exp. Appl. Acarol., Analysis of the frequency with which the idiosomal setae occur on the adult females of 1,545 species of Phytoseiidae suggests that there has been discontinuous variation in the suppression of these setae. The process of suppression is more advanced with the setae first expressed in the postlarval stages of ontogeny than with those first expressed in the larval stage.… Show more

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Cited by 11 publications
(10 citation statements)
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References 13 publications
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“…This is consistent with the observations of Chant (1993a) regarding discontinuous variation in the suppression of dorsal setae in the Phytoseiidae. The 7 setae that have been almost entirely suppressed are: J1, J3, J4, z6, Z2, Z3, and r5.…”
Section: Discussionsupporting
confidence: 93%
See 1 more Smart Citation
“…This is consistent with the observations of Chant (1993a) regarding discontinuous variation in the suppression of dorsal setae in the Phytoseiidae. The 7 setae that have been almost entirely suppressed are: J1, J3, J4, z6, Z2, Z3, and r5.…”
Section: Discussionsupporting
confidence: 93%
“…It is noteworthy that 12 of the 30 dorsal setal patterns are monotypic. Chant (1993a) discussed discontinuous variation in the suppression of the setae whose presence is variable in the Phytoseiidae. We suggest that there are 3 different Downloaded by [University of Saskatchewan Library] at 13:37 13 October 2012 Vol.…”
Section: Subfamily Amblyseiinae Mumamentioning
confidence: 99%
“…Further investigation using electron microscopy should help characterize homologies within this morphological structure. Habitus of the dorsal shield. The dorsal chaetotaxy in Parasitiformes has been considered as phylogenetically informative for genus definition (Chant, 1993; Chant & McMurtry, 1994). Because the exoskeleton is in contact with the environment, however, a great level of homoplasy is assumed: more than one‐thord of the known phytoseiid species, for instance, have the same dorsal and ventral setal pattern (Chant & Yoshida‐Shaul, 1989, 1991), even if they are assumed to belong to different genera.…”
Section: Resultsmentioning
confidence: 99%
“…Setal suppression has resulted in extensive paedomorphosis because the setae expressed later in ontogeny on the ancestral form have been suppressed more extensively. The result is that adult setation of the more hypotrichous phytoseiids now resembles immature setation of modern holotrichous blattisociines (Chant, 1993c idiosomal setae seems to have been discontinuous over time, or punctuated (Chant, 1993a).…”
Section: Introductionmentioning
confidence: 96%
“…They probably diverged from this common ancestor when the higher plants emerged, about 80 million years ago (Chant, 1993a). The Phytoseiidae are the only group of Mesostigmata to have exploited the foliage habitat of higher plants extensively (McMurtry and Rodriguez, 1987).…”
Section: Introductionmentioning
confidence: 99%