Moinodaphnia macleayi ( King, 1853 )

Kotov, Alexey A., Jeong, Hyun Gi & Lee, Wonchoel, 2012, Cladocera (Crustacea: Branchiopoda) of the south-east of the Korean Peninsula, with twenty new records for Korea *, Zootaxa 3368, pp. 50-90 : 60-61

5. Moinodaphnia macleayi ( King, 1853)

Fig. 7

Synonymy. Moina macleayi King, 1853 , p. 251–252, Pl. 5.

Moinodaphnia macleayi (King) in Goulden 1968, p. 84–87, Figs 45–46; Smirnov 1976, p. 187–189, Figs 165–166; Chiang & Du 1979, p. 161–162, Fig. 108.

Moina submucronata Brady, 1886 , p. 294, Pl. 37: figs 4–5.

Type locality. "Pond near Elizabeth Bay, Sydney" ( King 1853), New South Wales, Australia.

Locality in Korea. 6 a (see Fig. 1 and Table 1).

Parthenogenetic female. Body subovoid, dorsal margin with a wear cervical incision, postero-dorsal angle as a rounded triangle ( Fig. 7 A–B), posterior margin fluently turned to ventral margin without any angle, ventral margin convex; no hairs anywhere else on the head or valves. Body compressed laterally, with a well-expressed median keel on dorsal portion of valves. Head small, sub-triangular, with a shallow supra-ocular depression above large compound eye which fills the tip of the head; ocellus small ( Fig. 7 B). Valves reticulated, ventral margin with denticles, a pair of submarginal hooks at the point where the valves come together ( Fig. 7 C). Postabdomen with wide preanal and narrow postanal portions, preanal margin large and lacking long setules, preanal angle distinct, anal margin straight, postanal angle expressed, postanal margin straight ( Fig. 7 D). On postanal portion, eight-nine feathered lateral teeth plus a long, bident tooth near base of postabdominal claw. Postabdominal claw long, with two pectens of thin setules. Antenna I long, cylindrical, antennular sensory seta originated somewhat proximally to its middle; nine very short aesthetascs distally ( Fig. 7 A). Antenna II thin and long, basal segment with a long seta on posterior side ( Fig. 7 E). Antennal formula: setae 0- 0-1 - 3 / 1 - 1-3, spines 0-1 - 0-1 /0- 0-1. Apical spine on exopod specially long, so, it is sometimes counted as a seta ( Smirnov, 1976), but we think that antennal formula as suggested here is more correct for homologization of setae and spines on antenna II on Moinodaphnia and other anomopods. Limb I as illustrated in Fig. 7 F. Size in our material 0.7–1.2 mm.

Notes. According to Smirnov (1976), Moinodaphnia macleayi is a circumtropical species. Most probably Korea is the northernmost area of its distribution. The species is also known from China ( Chiang & Du 1979) and Japan ( Mizuno & Takahashi 1991). This is the first record for Korea.