Taxonomy and Phylogeny of the Aphid Genus Nippolachnus Matsumura, 1917, with Synonymy of the Mysterious Neonippolachnus Shinji, 1924 (Hemiptera: Aphididae: Lachninae)

Matsumura, 1917 is a small aphid genus from the tribe Tuberolachnini (Hemiptera: Lachninae) occurring in Southeast Asia. Species from this genus are quite characteristic and stand out among lachnids for their morphology and ecological associations. We have performed a revision and phylogenetic analyses to elucidate the relationships within and other representatives of Tuberolachnini. Here, the taxonomy of the genus is revised based on morphological data to include seven species, three of them newly described: . . from India, . . from China, and . . from Indonesia. appear to be non monophyletic genus and a new genus, . ., is described to accommodate (van der Goot, 1917) as (van der Goot, 1917) . . The new genus is a sister group to the remaining species, which created a monophyletic clade. Shinji, 1924 . . is recognised as a synonym of , and Shinji, 1924 . . as a synonym of Shinji, 1924. For the first time, a scanning electron microscopy study of the sexual generation of Matsumura, 1917 has been performed. Apterous and alate viviparous females of Basu and Hille Ris Lambers, 1968, , and , and alate viviparous females of Zhang and Zhong, 1982 are re-described and illustrated, as well as apterous and alate viviparous females of . . Hitherto unknown morphs of , , and are described. A lectotype and paralectotypes of N. x are designated herein. Notes on distribution and host plants are given, and keys to apterous and alate viviparous females of the genera and are also provided.