Kurzia (Rostrokurzia) longirostris ( Daday, 1898 )

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 : 79-80

17. Kurzia (Rostrokurzia) longirostris ( Daday, 1898)

Fig. 23

Synonymy. Alona longirostris Daday, 1898 , p. 34–35, Fig. 14 a–c.

Kurzia longirostris (Daday) in Rajapaksa & Fernando 1986, p. 2590–2595, Figs 1–50; Hudec 2000, p. 175–176, Figs 35–44.

Type locality. "Colombo (Beira) Lake, Colombo"( Rajapaksa & Fernando 1986). Locality in Korea. 8 (see Fig. 1 and Table 1 ).

Parthenogenetic female. Body ovoid, high in lateral view, dorsal margin regularly curved from tip of rostrum to slightly expressed postero-dorsal angle, posterior margin convex, postero-ventral angle broadly rounded, ventral margin with a prominence anteriorly to middle ( Fig. 23 A). Body compressed laterally, with a medial keel on carapace, but not on head. Rostrum long, ocellus about half size of compound eye ( Fig. 23 B). Three major head pores connected, posterior pore transversely elongated, lateral pores minute. Labrum with large, triangular labral keel, anterior margin, its apex with a small hillock ( Fig. 23 B). Submarginal setules on posterior margin subequal in size. Postabdomen elongated, with concave postanal margin; dorso-distal angle of postabdomen remarkably projected; postanal teeth about 9–11, relatively robust in distal portion of the postabdomen ( Fig. 23 C). Postabodminal claw long, slightly curved, with a single short basal spine (as long as claw width), bearing a series of 5–6 thin spinules. Antenna I elongated, sensory seta in middle, nine aesthetascs of unequal size, three longest ones almost reaching tip of rostrum ( Fig. 23 B). Antenna II short, antennal formula: setae 0-0-3/1-1-3, spines 1-0-1/ 0-0-1. Limb I with ODL bearing a single bisegmented seta, setulated distally ( Fig. 23 D), IDL with three setae, the shortest seta unilaterally setulated, other two setae heavily chitinized, hook-like, with additional teeth on proximal portion; distal portion with a row of setules decreasing to tip ( Fig. 23 D–E). Size in our material 0.50–0.62 mm.

Notes. Rajapaksa & Fernando (1986) concluded that K. longirostris is found in Australia, Bangladesh, Burma, Ghana, Guatemala, India, Indonesia, Malaysia, Nigeria, Papua New Guinea, Paraguay, Philippines, Tanzania, and Thailand. It also occurs in some other tropical and subtropical countries, i.e., Israel ( Bromley 1993), Chad ( Rey & Saint-Jean 1968), Sudan ( Green 1984), Mexico (Van de Velde et al. 1978) and Cambodia ( Tanaka & Ohtaka 2010), making it a tropical-subtropical taxon. We found it far north from the tropics, and Korea is, most probably, the northernmost area of its distribution. Kurzia longirostris is definitively absent in Far East of Russia, while K. cf. latissima is common in the area of Lake Khanka (Kotov, unpublished) and is also known for China ( Chiang & Du 1979). This is the first record of the genus Kurzia for Korea.

Figures

FIGURE 14. Macrothrix rosea (Jurine, 1820), appendages of parthenogenetic female from Ho Tan wetland: A, antenna I; B, antenna II, anterior view; C – D, setae of endopod proximal segment; E, distal portion of limb I. Scale bars: 0.1 mm.

FIGURE 23. Kurzia (Rostrokurzia) longirostris (Daday, 1898), parthenogenetic female from Bak Sil Ji 3, locality 8: A, lateral view; B, head; C, postabdomen; D – E, distal portion of limb I. Scale bars: 0.1 mm.