The genus Leucophenga (Diptera, Drosophilidae), part VI: the argentata species group from the East Asia, with morphological and molecular evidence

Six species of the Leucophenga argentata species group from East Asia are examined (including one known and five new ones): L. argentata (de Meijere, 1914); L. bicuspidata sp. nov.; L. fuscivena sp. nov.; L. longipenis sp. nov.; L. quadricuspidata sp. nov.; L. tricuspidata sp. nov.; the diagnoses for Asian species of the argentata group and a key to these species are provided. A total of 44 DNA sequences of the mitochondrial COI (cytochrome c oxidase subunit I) gene with BOLD process ID and GenBank accession numbers are provided for these species. The intra- and interspecific pairwise p-distances are summarized. The NJ (Neighbor-joining) and the Bayesian analyses are used to conduct a molecular phylogenetic analysis for the above-mentioned species. The molecular data are used as complementary evidence for the identification of the argentata group species with sexually dimorphic abdominal tergites.