Sganga Julieta V, Sganga Daniela E, Iglesias Mónica S
Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, C1428 EHA, Buenos Aires, Argentina Universidad de Buenos Aires Buenos Aires Argentina.
National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark Technical University of Denmark Lyngby Denmark.
Zookeys. 2022 Jul 11;1111:389-412. doi: 10.3897/zookeys.1111.80961. eCollection 2022.
The species group includes five species distributed in northeastern Argentina and Brazil: Smicridea (Rhyacophylax) brasiliana (Ulmer), S. (R.) weidneri Flint, S. (R.) vermiculata Flint, S. (R.) arobasis Flint, and S. (R.) nanda Flint. The original descriptions of these species and their placement in the species group were mainly based on the morphology of the male genitalia. However, the fine structure of the internal sclerites of the phallus, which proved to be useful for species delimitation, was not analyzed at the time. In this contribution, we provide a detailed description of the male genitalia and the morphology of the head, and analyze the shape of the wings using geometric morphometrics. The analyzed species can be easily differentiated by the shape of the phallus, especially by the structure of the internal sclerites, the shape of the head in dorsal view, and the shape of the cephalic setose warts. Furthermore, the geometric morphometric approach allowed their separation through the wing shape. The preliminary analysis of these features suggests that the species group is not natural but its monophyly should be further tested within the framework of a phylogenetic analysis of all the species of the subgenus Rhyacophylax.
巴西细蜉（Smicridea (Rhyacophylax) brasiliana (Ulmer)）、魏氏细蜉（S. (R.) weidneri Flint）、蠕虫细蜉（S. (R.) vermiculata Flint）、阿罗巴斯细蜉（S. (R.) arobasis Flint）和南达细蜉（S. (R.) nanda Flint）。这些物种的原始描述及其在物种组中的归属主要基于雄性生殖器的形态。然而，当时并未分析阴茎内部骨片的精细结构，而这一结构后来被证明对物种界定很有用。在本论文中，我们详细描述了雄性生殖器和头部形态，并使用几何形态测量学分析了翅膀的形状。所分析的物种可以通过阴茎的形状，特别是内部骨片的结构、背面观头部的形状以及头部刚毛疣的形状轻松区分。此外，几何形态测量学方法能够通过翅膀形状将它们区分开来。对这些特征的初步分析表明，该物种组并非自然形成，但其单系性应在对细蜉亚属（Rhyacophylax）所有物种进行系统发育分析的框架内进一步检验。
