Karualona serrulata Van Damme, Maiphae et Sa-adrit, 2013

27. Karualona serrulata Van Damme, Maiphae et Sa-adrit, 2013

Localities and specimens found: 50 – 2♀, 1j; 51 – 10♀, 3♀ ov, 1♀ em, 3j.

Distribution and ecology. This is a rare species, one more endemic to Southeast Asia. Currently, K. serrulata is known in Thailand, Laos, Vietnam and Indonesia ( Kotov et al. 2013b; Sinev & Korovchinsky 2013; Van Damme et al. 2013; Sinev 2016, 2017; Choedchim & Maiphae 2023). In Thailand, Laos and Vietnam, it was first listed as Karualona sp. ( Kotov et al. 2013b; Sinev & Korovchinsky 2013; Van Damme et al. 2013). The location in the work of Sinev & Korovchinsky (2013), Bau Sau Lake in Cat Tien National Park (Dong Nai Province), is so far the only known habitat of this species in Vietnam. We found K. serrulata in the same lake among the roots of water hyacinth and Salvinia , together with the above noted congener K. fatimae (see Appendix 1).

As many other small chydorids, K. serrulata is obviously a littoral, phytophilous species. To date, it has been recorded in swamps and in a shallow, vegetation-rich lake ( Kotov et al. 2013b; Sinev & Korovchinsky 2013; Van Damme et al. 2013; present study).