Subfamily Aloninae

Alona cambouei de Guerne & Richard, 1898. Rare species in Sabah, found in one pond and in a paddy field. Littoral species, associated with vegetation. For detailed description, see Sinev (2001). Distributed in Mediterranean region, Africa and tropical Asia, frequently associated with paddy fields. Recorded by Idris (1983) as Alona cf. pulchella King, 1853 .

Anthalona harti harti Van Damme, Sinev & Dumont, 2011. Found in six ponds and a lake; ephippial female and male were found in loc.12. For detailed descriptions see Van Damme et al. (2011) and Sinev & Kotov (2012). Distributed in tropical Asia, Mediterranean region, and Africa (Van Damme et al. 2011, Sinev & Kotov 2012). Recorded by Idris (1983) as Alona verrucosa Sars, 1901 .

Anthalona sp. A single specimen (Fig. 1 E) was found in a lake (loc. 12) together with A. harti . It differs from both Anthalona harti harti and described from Borneo Anthalona obtusa Van Damme, Sinev & Dumont, 2011 by unusual morphology of postabdomen, with weakly developed preanal angle. Unfortunately, specimen was lost due to the unsuccessful dissection. We speculate it belongs to a new, not yet described species of Anthalona.

Coronatella cf. rectangula (Sars, 1862) . Rare in Sabah, a single specimen was found in a pond (loc. 24). Littoral species. C. rectangula s. str. is a common Palearctic species. The south border of C. rectangula s. str. distribution is unknown, species is reported from South-East Asia and India. Morphology of Malaysian specimens agreed with description of C. rectangula by Frey (1988) and Van Damme & Dumont (2008), but they have more narrow postabdomen, slightly narrowing in postanal portion (see Idris 1983). Future studies of C. rectangula complex are needed. Recorded by Idris (1983) as Alona cf. rectangula Sars, 1862 .

Coronatella cf. acuticostata (Sars, 1903) . Rare species here, several specimens were found in one lake (loc. 12) and one pond (loc. 13). This taxon is usually recorded in South-East Asia as Alona monacantha Sars, 1901 or Coronatella monacantha (Sars, 1901) . It is rather common in South-East Asia, being recorded from Thailand, Malaysia, Laos and Cambodia. Recorded by Idris as Alona cf. monacantha Sars, 1901 . C. monacantha s. str. was described from South America and probably is only Neotropical species (Sinev 2004). C. acuticostata (Sars, 1903) was described from Sumanta and is probably distributed in whole South-East Asia, but this species should be redescribed (Van Damme et al. 2010). Morphology of studied specimens from Sabah (Fig. 1 F–J) agrees well with description of Malaysian population by Idris (1983, recorded as Alona monacantha), but differs from C. monacantha s. str. (see Sinev 2004) in two important characters. Sabah C. cf. acuticostata has postabdominal claw (Fig 1 H) with slightly curved, thick basal spine (in C. monacantha it is straight and thin). Setae of inner distal lobe of thoracic limb I in C. cf. acuticostata from Sabah bear very long spines (Fig. 1 J), two basalmost spines of inner distal lobe seta 2 are almost as long as basal part of the seta, while in C. monacantha these spines are 2.5 times shorter than basal part of the seta.

Euryalona orientalis (Daday, 1898) . Rare species here, found in one pond and in a paddy field. Littoral species, associated with vegetation. For detailed description see Rajapaksa & Fernando (1987a). According to these authors, a common pantropical species.

Karualona karua (King, 1853) . Species described from Australia and reported from Africa and tropical Asia; according to some authors, K. karua is a species-complex. All studied populations have similar morphology and are similar to the form reported by Van Damme et al. (2013) from South Thailand, Kotov et al. (2013) from Laos and Sinev et al. (2015 in press) from Hainan; these populations are characterized by very small basal spine of postabdominal claw.

Leydigia ciliata Gauthier, 1939 . Rare species in Sabah, found only once in a paddy field. Benthic species, associated with muddy or clay bottom. For detailed description see Kotov et al. (2003), for description of male see Sinev and Sanoamuang (2011). Known in Africa, tropical Asia, common in Oriental region.

Notoalona globulosa (Daday, 1898) . Rare species, found in one ditch and in a paddy field. Littoral species, associated with vegetation. For detailed description see Rajapaksa & Fernando (1987b). Distributed in Africa and tropical Asia. Recorded by Idris (1983) as Indialona globulosa (Daday, 1898) .

Oxyurella singalensis (Daday, 1898) . One of the common species, found in all types of localities but lakes. Littoral species, associated with vegetation. Recently shed ephippia were found in locality 5. Littoral species, associated with vegetation. For description see Idris (1983), for description of male – Sinev & Sanoamuang (2011). Common Oriental species.