Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160 (C1428EHA), 4º piso Pabellón II, Ciudad Universitaria, CABA, Argentina.
Laboratorio de Biodiversidad y Genética Ambiental/BioGeA, Universidad Nacional de Avellaneda, Mario Bravo 1460 esq. Isleta, 1870, Piñeyro, Buenos Aires, Argentina.
An Acad Bras Cienc. 2023 Jul 17;95(suppl 1):e20220583. doi: 10.1590/0001-3765202320220583. eCollection 2023.
Perithemis mooma, Kirby, 1889 and Perithemis icteroptera (Selys in Sagra, 1857) live in sympatry from southern Brazil to central Argentina. The taxonomy of the genus Perithemis Hagen, 1861 has been hampered by the use of characters that are highly variable or show slight differences among species. Our objective was to assess the efficiency of traditional morphometrics (TM) and geometric morphometrics (GM) to discriminate between these species using wing size and shape and vulvar lamina contour, and to analyze the presence of sexual dimorphism in wing size and shape in both species. The TM and landmark-GM methods were applied on the fore and hind wings, while the outline-based GM method was applied on the vulvar lamina. GM allowed species delimitation using shape variables of either wing. The wing and vulvar lamina shapes were confirmed to be good diagnostic characters to separate these species and appear to be promising tools for distinguishing among other species of this genus. Centroid size failed to achieve species separation. Both species exhibited sexual size dimorphism (SSD). In contrast to what would be expected for Perithemis whose males are strongly territorial, P. icteroptera and P. mooma showed female-biased SSD suggesting a common pattern in Perithemis.
摩氏伊蚊和黄翅伊蚊在南美的巴西至阿根廷中部地区共存。由于使用了高度可变或在物种间存在细微差异的特征，使得 Perithemis Hagen, 1861 属的分类学一直受到阻碍。我们的目标是评估传统形态计量学（TM）和几何形态计量学（GM）在使用翅膀大小和形状以及外阴片轮廓区分这些物种方面的效率，并分析这两个物种在翅膀大小和形状上存在的性二型性。TM 和地标-GM 方法应用于前翅和后翅，而基于轮廓的 GM 方法应用于外阴片。GM 允许使用任一种翅膀的形状变量来进行物种划分。翅膀和外阴片的形状被证实是区分这些物种的良好诊断特征，并且似乎是区分该属其他物种的有前途的工具。质心大小未能实现物种分离。两个物种都表现出性体型二型性（SSD）。与雄性具有强烈领地性的 Perithemis 预期相反，P. icteroptera 和 P. mooma 表现出雌性偏 SSD，这表明 Perithemis 中存在一种共同模式。
