. The Isturgia limbaria (Fabricius, 1775)/roraria (Fabricius, 1776) complex is analyzed, taking into consideration the external morphology of the adults (coloration and pattern of upperside and underside of wings), the morphology of the female genitalia (signum and lamella postvaginalis), of the tympanal organs and of the preimaginal stages, as well as molecular data. Based on the molecular data and morphology of signum and tympanic organs, the populations of this complex can be divided into two groups, one more western (with the taxa limbaria s. str. and delimbaria), distributed east to north-western Italy and part of Germany, and one more eastern (with the taxa roraria s. str., rablensis and anzascaria), distributed west to northern and eastern Piedmont (Italy) and north-eastern and south-eastern Germany. However, there are no consistent differences between the two groups in the diagnostic characters used until now to identify the two taxa (pattern of the wing upperside and underside). Although there is a considerable genetic distance between these two groups, the correlation between molecular differences and morphological characters (size of the signum and presence ̶ or absence ̶ of a roundish lobe in the bullae tympani) is not completely constant and the two groups of populations are not completely separated from each other: some populations of the northern Apennines (taxon delimbaria) cannot be clearly attributed to one or the other group. In the absence of constant morphological characters associated with the molecular differences and in the presence of Italian populations with intermediate characters, we suggest that the different taxa of this complex be considered as subspecies of the same species, as already proposed by Povolný and Moucha (1957, 1959). However, the data available do not allow definitive clarification of the taxonomic problem and further research is necessary.

中文翻译：

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观察到Isturgia limbaria（Fabricius，1775）/ roraria（Fabricius，1776）复合体（鳞翅目，Geometridae，Ennominae）

。分析了Isturgia limbaria（Fabricius，1775）/ roraria（Fabricius，1776）复合体，并考虑了成年人的外部形态（翅膀的上侧和下侧的颜色和样式），女性生殖器的形态（指和薄片）后阴道），鼓膜器官和想象前阶段以及分子数据。根据触角和鼓膜器官的分子数据和形态学，该复合体的人群可分为两类，另一类是西方的（有紫杉类和纤毛类），分布于意大利的东西到西北部，还有一部分德国，另外一个东部（带有roraria s.str。，rablensis和anzascaria的分类单元）分布在西至北部和东部的皮埃蒙特（意大利）以及东北和德国的东南部。然而，到现在为止，用于识别两个分类单元（机翼上侧和下侧的模式）的诊断字符在两组之间没有一致的差异。尽管这两类人群之间存在着相当大的遗传距离，但分子差异和形态特征（鼓风鼓中的圆形叶的信号大小和存在或不存在）之间的相关性并不完全恒定，并且这两组人群之间彼此之间没有完全分开：北亚平宁山脉的某些种群（紫杉类群）不能明确归因于另一类。在没有与分子差异相关的恒定形态特征的情况下，并且在具有中等特征的意大利人群中，我们建议将此植物群的不同分类单元视为同一物种的亚种，正如Povolný和Moucha（1957，1959）已经提出的那样。但是，可用的数据不能明确澄清分类学问题，因此有必要进行进一步的研究。