Cytology of Coccids (Coccoïdea-Homoptera)

Hughes‐Schrader, Sally

doi:10.1016/s0065-2660(08)60468-x

Cited by 266 publications

(124 citation statements)

References 44 publications

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“…In neococcoids and a few archaeococcoids, there are several other systems (Miller & Kosztarab, 1979). It is noteworthy that Hughes-Schrader (1948) and Brown and Cleveland (1968), on the basis of chromosome behaviour, suggested that Puto is more distantly related to pseudococcids than usually supposed.…”

Section: Phylogenetic Conclusionmentioning

confidence: 97%

“…For over sixty years it has been known that the genus Puto is characterized by a primitive chromosome system, termed a "XX-XO chromosome system" (Hughes-Scharader, 1944). Besides Puto, this sex determining system is found in aphids (Blackman, 1985) and most archaeococcoids (Hughes-Schrader, 1948). In neococcoids and a few archaeococcoids, there are several other systems (Miller & Kosztarab, 1979).…”

Section: Phylogenetic Conclusionmentioning

confidence: 99%

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Germ cell cluster formation and ovariole structure in Puto albicans and Crypticerya morrilli (Hemiptera: Coccinea). Phylogenetic implications

Szklarzewicz¹,

Michalik²,

Czaja³

et al. 2010

Eur. J. Entomol.

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Abstract. The organization and development of ovaries in representatives of two families (Putoidae and Monophlebidae) of scale insects are described. Developing ovaries of Puto albicans McKenzie, 1967 and Crypticerya morrilli (Cockerell, 1914) consist of numerous clusters of cystocytes that are arranged in the form of rosettes. At the end of the last nymphal instar these clusters start to protrude from the interior of the ovary into the body cavity and the ovarioles begin to be formed. The ovary of a young female is composed of about 200 spherical telotrophic ovarioles devoid of terminal filaments. The ovarioles of C. morrilli contain 8 germ cells (7 trophocytes and a single oocyte). From 25 to 45 germ cells (23-43 trophocytes and 2 or 3 oocytes) occur in the ovarioles of P. albicans. An ovariole of an adult female is subdivided into a trophic chamber (tropharium), vitellarium and ovariolar stalk (pedicel). At each stage of development, the ovaries are accompanied by large cells (termed bacteriocytes) that contain endosymbiotic microorganisms. The organization of the ovary in P. albicans is more similar to that in archaeococcoid scale insects than in neococcoid taxa. In contrast, the number of germ cells per ovariole in C. morrilli is not typical of other archaeococcoids, but resembles the derived condition seen in other iceryine taxa. The classification and phylogeny of scale insects are discussed in the light of these results.

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Section: Phylogenetic Conclusionmentioning

confidence: 97%

Section: Phylogenetic Conclusionmentioning

confidence: 99%

Germ cell cluster formation and ovariole structure in Puto albicans and Crypticerya morrilli (Hemiptera: Coccinea). Phylogenetic implications

Szklarzewicz¹,

Michalik²,

Czaja³

et al. 2010

Eur. J. Entomol.

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“…If the absence of chiasma terminalization is a general phenomenon in organisms with holokinetic chromosomes, the very existence of inverted meiosis must be questioned, because in many of these organisms, in Odonata (Oksala, 1943(Oksala, , 1945, and in Coccoidea (Hughes-Schrader, 1948) bivalents with nonterminal chiasmata are described in diakinetic nuclei.…”

Section: Chiasma Term Inalizationmentioning

confidence: 99%

The absence of chiasma terminalization and inverted meiosis in males and females of Myrmus miriformis Fn. (Corizidae, Heteroptera)

Nokkala

1997

Heredity

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“…Hughes-Schrader and Ris (1941), submetting Steatococcus chromosomes to X-ray treatment, observed that the resulting fragments orient and move correctly through many cell generations. After this experimental demonstration of the viability of chromosomal fragments, homopteran chromosomes have been considered as definitively provided with diffuse kinetochore (see review in Hughes-Schrader 1948), and Schrader's opinion was generalized to cover the whole order of Hemiptera. Thenceforth, almost all the investigators of hemipteran cytology have followed the Schraders in considering the chromosomes of these insects as having diffuse kinetochore.…”

Section: Introductionmentioning

confidence: 99%

Contribution of <i>Scaptocoris castaneus</i> to the Kinetochore Problem in Hemiptera

Piza

1957

CYTOLOGIA

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Cytology of Coccids (Coccoïdea-Homoptera)

Cited by 266 publications

References 44 publications

Germ cell cluster formation and ovariole structure in Puto albicans and Crypticerya morrilli (Hemiptera: Coccinea). Phylogenetic implications

Germ cell cluster formation and ovariole structure in Puto albicans and Crypticerya morrilli (Hemiptera: Coccinea). Phylogenetic implications

The absence of chiasma terminalization and inverted meiosis in males and females of Myrmus miriformis Fn. (Corizidae, Heteroptera)

Contribution of <i>Scaptocoris castaneus</i> to the Kinetochore Problem in Hemiptera

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