Two cryptic species of the black-tailed bamboo aphid, Takecallis arundicolens (Clarke, 1903), are revealed based on DNA barcoding and nymph morphology. Three species, T. arundicolens, T. sp.1 nov. and T. sp.2 nov. have significant genetic differences ranged from 2-8% but, only subtly differing in their nymph morphology. In this study, molecular analyses and morphological comparisons are presented including species keys for alatoid nymphs.

• Yerim Lee(Laboratory of Insect Biosystematics, Department of Agricultural Biothechnology, Seoul National University, Seoul 151-921)
• Seunghwan Lee(Laboratory of Insect Biosystematics, Department of Agricultural Biothechnology, Seoul National University, Seoul 151-921 , Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 151-921)