The current interpretation of two common European species, Mordellistena minima Costa, 1854 and M. pseudorhenana Ermisch, 1977, is based on misidentification. The confusion regarding the identity of the species is fixed based on the revised type material. Here, the species are redescribed, and diagnostic characters are provided. Mordellistena pseudorhenana is revalidated. Mordellistena emeryi Schilsky, 1895 is recognised as a new synonym of M. minima. Mordellistena sajoi Ermisch, 1977 is recognised as a new synonym of M. pseudorhenana. Lectotype and paralectotypes of M. emeryi are designated. Mordellistena pseudorhenana is reported for the first time from Bosnia and Herzegovina, Slovenia, and Switzerland. Two morphotypes of M. pseudorhenana differing in size and shape of the parameres are recognised. Morphological differences are quantified and displayed using principal component analysis. In addition, DNA barcodes have been used for the first time in family Mordellidae to examine the divergences between the species and to interpret the morphological variability observed in M. pseudorhenana. Low genetic divergences did not provide the evidence for considering the morphotypes as separate species. The discrepancy between the morphological and molecular evidence raises questions about the efficiency of the CO1 gene for Mordellidae identification and the stability of morphological traits conventionally used for species separation.

当前对两种常见欧洲物种的解释是基于错误识别，该物种为极小Mordellistena minima Costa（1854年）和M. pseudorhenana Ermisch（1977年）。有关物种身份的困惑是根据修订后的类型材料解决的。在此，对物种进行了描述，并提供了诊断特征。Mordellistena pseudorhenana被重新验证。Mordellistena emeryi希勒斯基，1895年是公认的新代名词的M.极小。Mordellistena sajoi Ermisch，1977年被认为是M. pseudorhenana的新同义词。选型和paralectotypes M. emeryi被指定。波斯尼亚和黑塞哥维那，斯洛文尼亚和瑞士首次报道了假单胞菌。可以识别出两种假单胞菌的形态学类型，它们在大小和形状上都不同。使用主成分分析对形态差异进行量化和显示。此外，DNA条码已被首次用于Mordellidae家族中，以检查物种之间的差异并解释在假单胞菌中观察到的形态变异性。低遗传差异并没有提供将形态型视为独立物种的证据。形态和分子证据之间的差异提出了有关CO1效率的问题 基因用于Mordellidae鉴定和常规用于物种分离的形态特征的稳定性。