L. Du, Shu-Jing Li, Fei Xu, T. Luo, F. Luo, Guo-Hua Yu, Jiang Zhou
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引用次数: 1
摘要
鼻孔结构是线虫科和蠓科属诊断的重要特征。通过系统发育分析发现,nemachelidae科10个属(Eonemachilus、Guinemachilus、Lefua、Micronemacheilus、Oreonectes、Paranemachilus、Protonemacheilus、Traccatichthys、Troglonectes和Yunnanilus)共有管状前鼻孔,形成一个单系类群。在形态学上,前鼻孔和后鼻孔之间的位置分为三种类型:(i)分开,即距离大于后鼻孔直径的1.5倍;(ii)邻近,即距离小于后鼻孔的直径;(三)紧密相连,即前鼻孔的后缘与后鼻孔的前缘相连。因此,可以根据鼻孔特征来区分这10个属。此外,还发现了1个新属(Guinemachilus gen. nov.)和2个新种(Guinemachilus pseudopulcherrimus sp. nov.)和2个新种(Paranemachilus chongzuo sp. nov.)。
Clarification of Phylogenetic Relationships among Chinese Nemacheilids with Tube-Shaped Anterior Nostrils, with a Description of a New Genus and Two New Species
Nostril structures are important characteristics for generic diagnosis in Nemacheilidae and Cobitidae. Based on phylogenetic analysis, we found that 10 genera within Nemacheilidae (Eonemachilus, Guinemachilus, Lefua, Micronemacheilus, Oreonectes, Paranemachilus, Protonemacheilus, Traccatichthys, Troglonectes, and Yunnanilus) shared tube-shaped anterior nostrils and formed a monophyletic group. Morphologically, the location between the anterior and posterior nostrils was divided into three types: (i) separated, i.e., a distance greater than 1.5 times the diameter of the posterior nostril; (ii) adjacent, i.e., a distance shorter than the diameter of the posterior nostril; and (iii) closely set, i.e., posterior margin of the anterior nostril connected to the anterior margin of the posterior nostril. Thus, the 10 genera can be distinguished based on nostril features. Additionally, we describe one new genus, Guinemachilus gen. nov., and two new species, Guinemachilus pseudopulcherrimus sp. nov. and Paranemachilus chongzuo sp. nov.