Taxonomic revision of the genus Megoura Buckton (Hemiptera : Aphididae) from the Korean Peninsula with the description of a new species and a key to the world species

摘要

Three species of Megoura are recognized from the Korean Peninsula, among which Megoura nigra Lee, n. sp., and the fundatrix, hitherto unknown morph, of M. crassicauda Mordvilko 1919 are described. Megoura nigra can be distinguished easily from other species of Megoura by its dark brown body color in life. It also differs from the closely related species M. crassicauda and M. viciae Buckton 1876 by its relatively long ultimate rostral segment, 0.88-1.00X 2HT (0.63-0.87X in the latter two species), mandibular laminae, antennal segment I, abdominal tergite III, and genital plate with 68, 13-20, 16-21, and 24-33 hairs respectively (3-5, 8-15, 12-18, and 14-23 in the latter two species). After examining and measuring the specimens of all known Megoura spp., a worldwide key to species is presented.