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Male postabdomen reveals ancestral traits of Megasecoptera among winged insects.
Arthropod Structure & Development ( IF 1.7 ) Pub Date : 2020-04-30 , DOI: 10.1016/j.asd.2020.100944
Jakub Prokop 1 , Martina Pecharová 1 , Nina D Sinitshenkova 2 , Klaus-Dieter Klass 3
Affiliation  

External male genitalia of insects are greatly diverse in form and frequently used in evolutionary context and taxonomy. Therefore, our proper recognition of homologous structures among various groups from Paleozoic and extant insect taxa is of crucial interest, allowing to understand the key steps in insect evolution. Here, we reveal structural details of two Late Carboniferous representatives of Megasecoptera (families Bardohymenidae and Brodiopteridae), such as the presence of separated coxal plates VIII and ventral expansions of coxal lobes IX. Together with the confirmed presence of abdominal styli in some other members of Palaeodictyopterida (Diaphanopterodea) this suggests that early pterygotes may have had traits more archaic than expected. Whether or not these traits point to a stem-group relationship of Palaeodictyopterida to all other Pterygota as suspected by earlier authors remains unclear at this stage. Furthermore, the present study provides an updated comparison of male postabdomen morphology among extant species of wingless Archaeognatha and representatives of early diverging groups of Pterygota from the Late Carboniferous and Early Permian, the Megasecoptera (Palaeodictyopterida), Permoplectoptera (Ephemeroptera) and Meganisoptera (Odonatoptera).

中文翻译:

雄性腹后揭示有翅昆虫中Megasecoptera的祖先特征。

昆虫的外部雄性生殖器形式极为多样,并经常用于进化背景和分类学中。因此,至关重要的是,我们对古生代和现存昆虫类群的各个群体之间同源结构的正确认识至关重要,这使我们能够了解昆虫进化的关键步骤。在这里,我们揭示了巨鳞翅目的两个石炭纪晚期代表的结构细节(Bodohymenidae和Brodiopteridae家族),例如分离的co板VIII的存在和co叶IX的腹侧扩展。再加上在古柏科的其他一些成员中证实有腹部触笔的存在,这表明早期翼状may的性状可能比预期的要古老。如先前作者所怀疑的,这些特征是否指向古昆虫纲与所有其他翼龙的茎群关系目前尚不清楚。此外,本研究提供了现存的无翅始祖鸟种类和晚期石炭纪和早二叠纪翼节目,大翅目纲(Palaeodictyopterida),百翅目翅目(Ephemeroptera)和大翅目翅目(Odonatoptera)的早期分化群体的男性腹腔形态的最新比较。 。
更新日期:2020-04-30
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