首页> 外文期刊>Journal of Systematic Palaeontology >Protomiamia yangi gen. et sp. nov. (Early Pennsylvanian; Xiaheyan, China), a sexually dimorphic Palaeozoic stem-Orthoptera
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Protomiamia yangi gen. et sp. nov. (Early Pennsylvanian; Xiaheyan, China), a sexually dimorphic Palaeozoic stem-Orthoptera

机译:原始原生动物等。十一月(宾夕法尼亚州早期;中国夏河岩),是一种有性的二元古生代-直翅目

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摘要

The Xiaheyan locality in China is delivering an unprecedented corpus of data on Early Pennsylvanian insects. In this paper we describe a new species of stem-Orthoptera recovered from this locality, Protomiamia yangi gen. et sp. nov., for which the available sample allowed us to identify both male and female individuals based on distinctive terminalia on one hand, and a shared wing coloration pattern on the other. Other dimorphic aspects include body size, with that of the male being about two-thirds that of the female. Among extant polyneopteran insects such dimorphism is associated with the 'male-above-female' copulation position (more exactly, 'male-above-female-with-his-abdomen-twisted'), which we infer as the putatively plesiomorphic condition for crown-Orthoptera. The delimitation of ancient stem-Orthoptera species will have to take into account the possible occurrence of such sexual size dimorphism.
机译:中国的夏河沿地区正在提供有关宾夕法尼亚州早期昆虫的史无前例的数据集。在本文中,我们描述了从该地区恢复的新直立茎物种,Protomiamia yangi gen。等。十一月。为此,可用的样本一方面使我们能够根据独特的终末期来识别男性和女性,而另一方面则基于共享的机翼着色模式。其他二态性方面包括身体尺寸,其中男性的尺寸约为女性的三分之二。在现存的多翅目昆虫中,这种二态性与“雄性高于雌性”的交配位置(更确切地说,“雄性高于雌性且腹部扭曲”)有关,我们推断这是冠状的假定性条件-直翅目。古代茎直翅目物种的定界必须考虑到这种有性大小二态性的可能发生。

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