Daphniidae Straus, 1820

Sinev, Artem Y., Liu, Ping, Gu, Yangliang & Han, Bo-Ping, 2025, Autumn, winter and spring fauna of Cladocera in lakes and reservoirs of Jiangsu province, East China, Zootaxa 5722 (2), pp. 229-248 : 238

Family Daphniidae Straus, 1820

Ceriodaphnia cornuta Sars, 1885 . An abundant planktonic species, found only in November, in all studied lakes, is dominant in some plankton samples; ephhippial females and males were present in most localities. Taxon of unclear status, presumed to be a pantropical species group ( Sharma & Kotov, 2013), common in southern regions of China ( Xiang et al. 2015).

Ceriodaphnia laticaudata P.E. Müller, 1867 . Planktonic species, found only once in November in a ditch near Gaotang Lake (N23), it was very abundant there, ephippial females and males were present. Widely distributed Holarctic species, penetrating South up to Vietnam ( Korovchinsky et al. 2021b), is common in China ( Xiang et al. 2015).

Ceriodaphnia pulchella Sars, 1862 . Planktonic species, few parthenogenetic females were found in samples from Weishan Lake in November. Widely distributed Holarctic species ( Korovchinsky et al. 2021b), common in China ( Xiang et al. 2015).

Ceriodaphnia quadrangula (O.F. Müller, 1785) . Planktonic species, few parthenogenetic females were found in the park pond near Lake Tou in November. Widely distributed Holarctic species ( Korovchinsky et al. 2021b), common in China ( Xiang et al. 2015).

Daphnia ( Daphnia) galeata Sars, 1863 . Common planktonic species, found in all large lakes, except Lake Tou, and in smaller water bodies, not abundant in November, very abundant and usually dominant in January and March. Few males and ephippial females were present in some November samples; January and March samples contained only parthenogenetic females. A widespread Palearctic species common in China ( Xiang et al. 2015; Huang et al. 2022).

Daphnia ( Daphnia) obtusa Kurz, 1875 . Planktonic species, found in January in Zhaoyong, Hongze and Dazong lakes, and in March in Zhaoyong, Qili and Hushan lakes. Only parthenogenetic females were found in January, numerous ephippial females and males were present in March. A widespread Palearctic species or species complex ( Korovchinsky et al. 2021b).

Daphnia ( Daphnia) sinevi Kotov, Ishida & Taylor, 2006 ( Fig. 2A–C ). The first record for China. Planktonic species, found in March only, in littoral samples from lakes Dazong, Gaoyou, Hongze and Weishan, it was not present in pelagic samples. The species is known from the Far East of Russia ( Khabarovsk and Primorsky Areas), where it is common in small water bodies – pools, ponds and floodplain lakes (see Kotov et al. 2006; Garibian & Kotov 2020; Korovchinsky et al. 2021b).

Scapholeberis smirnovi Garibian, Neretina, Taylor & Kotov 2020 . Neustonic species, abundant in samples from overgrown littoral in November in most lakes, absent in January, and few, mostly juvenile specimens were found in March. S. smirnovi is known from the Russian Far East, Korea, and Japan (Garibian et al. 2020), presence of the species in East China was confirmed only recently ( Dadykin et al. 2023), all earlier record of Scapholeberis from the region were attributed to S. kingi Sars, 1903 ( Xiang et al. 2015).

Simocephalus ( Echinocaudus) exspinosus (De Geer, 1778) A littoral phytophilous species, found only in November, in Dazong Lake and several ponds. S. exspinosus is a widely distributed species ( Orlova-Bienkowskaja 2001; Korovchinsky et al. 2021b) occurring in North and South Eurasia, Africa, Australia, recorded in east China ( Xiang et al. 2015).

Simocephalus ( Simocephalus) mixtus Sars, 1903 .A phytophilous species common in the overgrown littoral zone of studied lakes during all seasons, especially abundant in ponds. Few ephippial females were found in November in ponds near Tou Lake (N7, N8). A cosmopolitan species found in North Eurasia, East Asia, North Africa and North America. The presence of the species in East China was confirmed only recently ( Dadykin et al. 2023), the species was probably recorded earlier as S. vetuloides Sars, 1898 (see Xiang et al. 2015).

Simocephalus (Coronocephalus) serrulatus (Koch, 1841) . Littoral phytophilous species found in Tou Lake and nearby ponds in November and March, it was also found in Zhaoyang Lake in March. The species is presumed to be distributed worldwide ( Orlova-Bienkowskaja 2001; Korovchinsky et al. 2021b). In China, widely distributed, but rare ( Xiang et al. 2015)

Figures

FIGURE2. Daphnia(Daphnia) sineviKotov,Ishida &Taylor,2006 from DazongLake, Jiangsuprovince,China,parthenogenetic female. A, lateral view. B, rostrum. C, postabdomen. Coronatella jejuana Sinev, Lee & Kotov 2023, from Dazong lake, Jiangsu province, China. Parthenogenetic female. D, lateral view. E, posteroventral margin of valves. F, antennule and antenna. G, IDL of thoracic limb I. H, postabdomen. Adult male. I, lateral view. J, postabdomen. K, antennule. L–N, details of thoracic limb I.