Karualona serrulata Van Damme, Maiphae & Sa-adrit 2013

Karualona serrulata Van Damme, Maiphae & Sa-adrit, 2013 Fig. 10I–L Sinev & Korovchinsky 2013: Fig. 2 H–K (Karualona sp.); Van Damme et al. 2013: 182–186, Fig 4–8; Sinev 2016: 473, Fig. 11I–K. Material examined: A single parthenogenetic female from a lake full of lotus, Paya Indah Wetland, Selangor (2.85820° N, 101.63171° E), 03.09.2022. This is the first record for Malaysia. Karualona serrulata is habitually similar to other East Asian species of the genus (Fig. 10I), but it can be easily distinguished from them by a peculiar morphology of the posteroventral angle of valves (Fig. 10J). It also differs from most common species of the region, K. fatimae Sinev & Semenyuk, 2023 (earlier recorded as K. karua King, 1853) in the absence of a spinule on anterior margin of labrum (Fig 10K) and in a well-developed basal spine of the postabdominal claw (Fig. 10L). For detailed description see Van Damme et al. (2013). Karualona serrulata is a rare species, an endemic of South-East Asia, so far known from South and North-East Thailand, Vietnam and Laos (Sinev 2016). The species is found in swamps and shallow lakes, littoral species, associated with vegetation.