Daphnidae

Sinev, Artem Y. & Yusoff, Fatimah M., 2018, New data on Cladocera (Crustacea: Branchiopoda) of Sabah State, Borneo Island, Malaysia, Zootaxa 4438 (2), pp. 362-372 : 363-364

Family Daphnidae

Simocephalus (Aquipiculus) cf. latirostris Stingelin, 1906 . Two specimens were found in Buyut Lake, in Kota Marudu (locality 20). Littoral species associated with vegetation, specimens are able to attach themselves to the substrate. According to Orlova-Bienkowskaya (2001), S. latirostris is distributed in South America only, and all records of this species from South-East Asia belong to S. heilongjiangensis instead. But morphology of studied specimen fully agrees with that reported by Idris (1983) for population of S. latirostris from Malaysia and by Sinev & Korovchinsky (2013) for population of S. cf. heilongjiangensis from Vietnam. Main distinctive characteristic of these populations is an elongated subrectangular rostrum, similar to that of South American S. latirostris s. str., while in S. heilongjiangensis rostrum is long but triangular, evenly narrowing distally (Orlova-Bienkowskaya 2001). In our opinion, status of these two species should be clarified by future studies.

Simocephalus (Simocephalus) mixtus (O. F. Mueller, 1776). Found in three oxbow lakes in Padas river valley (localities 3, 6, 8). A littoral species, associated with vegetation. Specimens are able to attach themselves to the substrate. Widely distributed species, recorded in all climatic zones of Northern Hemisphere (Orlova- Bienkowskaia 2001). In South-East Asia, so far it is known from Vietnam (Orlova-Bienkowskaia 2001) and Hainan Island ( Sinev et al. 2013), but probably it is distributed more widely. For description, see Orlova- Bienkowskaia (2001). First record for Malaysia.

Simocephalus (Coronocephalus) serrulatus (Koch, 1841). Abundant in locality 9 (pond in peat swamp area). A littoral species, associated with vegetation. Specimens are able to attach themselves to the substrate. For a description see Orlova-Bienkowskaia (2001), who reported that this is a cosmopolitan taxon, common in the Oriental region. For description of the Malaysian populations see Idris (1983).