title: On a desmitracheate "micronetine"Nippononeta alpina(Li & Zhu, 1993), comb. n. (Araneae, Linyphiidae).
abstract: The phylogenetic analyses based on molecular data demonstrate that all "micronetine" species of a desmitracheate system form a monophyly.MacrargusDahl, 1886 is a "micronetine" genus, the species of which have a haplotracheate system in general, whileMacrargus alpinusLi & Zhu, 1993 was found to have a desmitracheate system; this makes its generic placement problematic. According to the results of phylogenetic analysis, we transferMacrargus alpinusto another genus asNippononeta alpina(Li & Zhu, 1993),comb. n., and provide a redescription of its genital characters and somatic features. Comparisons with other "micronetine" species with a desmitracheate system are provided. Putative synapomorphies forNippononeta, the cladeNippononeta+Agyneta, and for the "desmitracheate micronetines" clade, as well as their relationship withHelophora, are provided and discussed.
authors.affiliation: College of Life Sciences, Capital Normal University, Xisanhuanbeilu Str. 105, Haidian Dist. Beijing, 100048, P. R. China.
authors.forename: Mengdie
authors.initials: M
authors.lastname: Bao
authors.affiliation: The High School Affiliated to Renmin University of China, Beijing, 100080.
authors.forename: Zishang
authors.initials: Z
authors.lastname: Bai
authors.affiliation: College of Life Sciences, Capital Normal University, Xisanhuanbeilu Str. 105, Haidian Dist. Beijing, 100048, P. R. China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Tu
keywords: Epigynal scape; genital morphology; phylogenetic placement; tracheal system