Brito R O, Affonso P R A M, Silva J C
Departamento de Ciências Biológicas, Universidade Estadual do Sudoeste da Bahia, Jequié, BA, Brasil.
Genet Mol Res. 2010 Nov 16;9(4):2230-8. doi: 10.4238/vol9-4gmr843.
The order Thysanoptera is composed of cosmopolitan phytophagous and predaceous insects with diverse life histories, behaviors and habits. This order is currently thought to form a trichotomy with Hemiptera and Psocodea; Hemiptera and Thysanoptera are considered to be sister groups. The interrelationships within Thysanoptera remain unclear and cytotaxonomic studies are scarce in thrips. We report, for the first time, chromosomal data on seven species of thrips collected from a semi-arid region in the States of Bahia and Pernambuco (Northeast Brazil). A distinctive chromosomal pattern was observed in Thysanoptera when compared to other members within the infraclass Paraneoptera. Considerable karyotypic differences were also found within genera and species of Thysanoptera. Based on these data, we suggest that Paraneoptera forms a polyphyletic group and that Terebrantia and Tubulifera should be regarded as sister groups. The high chromosomal variability observed in Thysanoptera indicates that chromosomal rearrangements have played a key role in their speciation pathways.
缨翅目昆虫遍布全球，包括植食性和捕食性昆虫，具有多样的生活史、行为和习性。目前认为该目与半翅目和啮目形成三分关系；半翅目和缨翅目被认为是姐妹类群。缨翅目内部的相互关系仍不明确，蓟马的细胞分类学研究也很稀少。我们首次报告了从巴伊亚州和伯南布哥州（巴西东北部）半干旱地区采集的七种蓟马的染色体数据。与副新翅下纲的其他成员相比，缨翅目呈现出独特的染色体模式。在缨翅目的属和种内也发现了显著的核型差异。基于这些数据，我们认为副新翅下纲是一个多系类群，管尾亚目和锯尾亚目应被视为姐妹类群。缨翅目中观察到的高染色体变异性表明染色体重排在它们的物种形成途径中起了关键作用。
