Distribution map of Vietnamella in the Oriental region. Each different shape represents a different species. Our specimens are only distributed in Thailand and including the data of Vietnamella sp. C from the BOLD system. Outside of Thailand distribution of Vietnamella is based on previous records including V. ornata (Tshernova, 1972), V. sinensis (Hu et al. 2017), Vietnamella sp. 1 (Tang et al. 2014), Vietnamella sp. A (Selvakumar et al. 2018) and V. thani (Hu et al. 2017 and unpublished data).