García-Román Jazmín, Armendáriz-Toledano F, Valerio-Mendoza O, Zúñiga Gerardo
Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Depto. Zoología, Laboratorio de Variación Biológica y Evolución. Prolongación de Carpio y Plan de Ayala, Col. Santo Tomas, Del. Miguel Hidalgo, CP, Ciudad de México, México.
J Insect Sci. 2019 Jan 1;19(1):14. doi: 10.1093/jisesa/iey131.
There have been numerous changes in the nomenclature of species of Dendroctonus. The case of Dendroctonus parallelocollis Chapuis and Dendroctonus approximatus Dietz has been particularly noteworthy. These bark beetles colonize pine trees but are not aggressive species. The high morphological similarity, their overlapping geographical distribution, and the limited knowledge of these species have resulted in taxonomic confusion. The aim of the present study was to assess morphological characters reported in the literature and to scrutinize new characters that might be useful for the separation of these species. We evaluated 26 morphological attributes and performed geometric morphometrics analysis of the antenna, pronotum, spermatheca, and seminal rod to test if the variations in the shape of these structures allow the recognition of additional discrete characters to differentiate them. Our results show that five double-state characters of external morphology are useful to identify these species, and the shape of antenna, spermatheca, and seminal rod.
齿小蠹属物种的命名法已经发生了许多变化。平行齿小蠹（Dendroctonus parallelocollis Chapuis）和近似齿小蠹（Dendroctonus approximatus Dietz）的情况尤其值得注意。这些树皮甲虫寄生于松树，但并非具有攻击性的物种。高度的形态相似性、重叠的地理分布以及对这些物种的了解有限，导致了分类学上的混乱。本研究的目的是评估文献中报道的形态特征，并仔细研究可能有助于区分这些物种的新特征。我们评估了26个形态学属性，并对触角、前胸背板、受精囊和精杆进行了几何形态计量学分析，以测试这些结构形状的变化是否能识别出更多离散特征来区分它们。我们的结果表明，外部形态的五个双态特征有助于识别这些物种，以及触角、受精囊和精杆的形状。
