Key for Ovalona species of South-East Asia

1. Distal denticles of postabdomen much longer than others. Main head pores connected....... .. Ovalona archeri (Sars, 1888)

1'. Length of postabdominal denticles evenly decrease basally. Main head pores without connection between them............................................................................ Ovalona cambouei (Guerne & Richard, 1893)