Biapertura affinis (Leydig, 1860) (= Alona affinis (Leydig, 1860)) .

Found in a single lake (S6) in Hunan. Common widely distributed (predominantly Palearctic) species, also present in Indo-Malaysian region and South Africa (Sinev 2020). Common in China (Ji et al. 2015). For detailed description see Sinev (2020).