Cytogenetics of six Brazilian species of Psocoptera

Zefa, Edison; Fontanetti, Carmem Silvia; Mesa, Alejo

doi:10.1590/s0100-84551996000400011

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2002

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“…All chromosomes are quite similar in size (3). The majority of karyologically studied psocopteran species have the haploid chromosome number n=9 ( Wong and Thornton 1966; Meinander et al 1974; Zefa et al 1996; Golub 1999). The chromosome number of V. flavidus from our material represents three times this modal number.…”

Section: Resultsmentioning

confidence: 99%

Cytogenetics of three parthenogenetic Psocid species (Psocoptera, Psocomorpha)

Nokkala

Голуб

2002

Hereditas

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A novel method was applied to study chromosomes and their behavior in female meiosis in three parthenogenetic psocid species (Psocoptera). Two of these species Valenzuela flavidus (Steph.), Caeciliusidae and Peripsocus subfasciatus (Rambur), Peripsocidae displayed a triploid chromosome number 3x=27 while the third species Trichadenotecnum majus (Kolbe) was diploid (2n=18). In all species meiosis consisted of only a single, mitosis‐like maturation division, i.e. meiosis was of apomictic type. Models for the formation of polyploid parthenogenetic forms are discussed.

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Section: Resultsmentioning

confidence: 99%