Cladocera (Crustacea: Branchiopoda) of the south-east of the Korean Peninsula, with twenty new records for Korea * Author Kotov, Alexey A. Author Jeong, Hyun Gi Author Lee, Wonchoel text Zootaxa 2012 3368 50 90 journal article 10.5281/zenodo.214313 f69535e8-6850-402e-992d-09316696daf4 1175-5326 214313 15. Camptocercus uncinatus Smirnov, 1971 Fig. 21 Synonymy. Camptocercus uncinatus Smirnov, 1971 , p. 436–438, Figs 128, 532; Smirnov 1998 , p. 76–77, Figs 51–57; Kotov et al. 2011a , p. 407. Camptocercus rectirostris (Schoedler) in Kim 1988 , Figs 58–59. FIGURE 21. Camptocercus uncinatus Smirnov, 1971 , parthenogenetic female from Bak Sil Ji 1, locality 6a: A, lateral view; B, head; C, labrum; D, armature of postero-ventral valve margin, inner view; E, armature of posterior valve margin, inner view; F, postabdomen; G, postabdominal claw; H, exopod of antenna II; I, distal portion of limb I. Scale bars: 0.1 mm. Type locality. "Lake Nikolaevskoe (Chita region)", Russia ( Smirnov 1971 , 1998 ). Localities in Korea . 6a, 8 (see Fig. 1 and Table 1 ). Parthenogenetic female. Body ovoid, elongated in lateral view ( Fig. 21 A); strongly compressed laterally and having a well-expressed dorsal keel both on carapace and head. Dorsal margin without depression between valves and head shield, postero-dorsal angle broadly rounded, posterior margin convex, postero-ventral angles broadly rounded. Ventral margin slightly undulated. Rostrum acute, pointed downward ( Fig. 21 B). Three connected main head pores, lateral pores minute. Labrum with a sub-triangular keel; its posterior margin without a denticle, with two groups of fine setules ( Fig. 21 B–C). Row of ventral setae followed by a row of fine setules, in dorsal portion of posterior margin they are strong, denticle-like ( Fig. 21 D–E). Postabdomen very long, narrowing distally, length about 5–6 height ( Fig. 21 F). Preanal portion almost straight, preanal angle well-developed, anal margin almost straight, postanal angle not expressed, postanal margin straight to slifhtly concave; postanal portion 3–4 times longer than anal one. Postanal margin with about 20 clustered postanal denticles with fused bases ( Fig. 21 G). Laterally series of fine setules. Postabdominal claw long, straight, with slightly curved tip; basal spine short, slightly bent, about 0.25 length of claw; few setules at the end of proximal pecten as strong spines ( Fig. 21 G). Antenna I with length about 4–5 width, with three groups of fine setules at anterior face; among nine aesthetascs two longer than the rest, longest aesthetascs as long as antenna I; antennular seta thin, about 1/3 length of antenna I, protruding somewhat distally to middle ( Fig. 21 B). Antenna II short, antennal formula: setae 0-0-3/0-1-3, spines 1- 0-1/0-0-1. Apical setae subequal in size, apical spines very short, spine on proximal exopod segment also very short ( Fig. 21 H). Limb I with ODL bearing a long seta, armed with long setules; IDL with three setae, seta 1 large, well developed, about 1/3 length of ODL seta; setae 2 and 3 thick, curved, hook-like, with a short, setulated distal portion ( Fig. 21 I). Size in our material 0.71–0.80 mm. Notes. Yoon (2010) recorded only C. rectirostris Schödler, 1862 from Korea but as his illustrations lack denticles on postero-ventral angle of valve, this is not rectirostris , but C. vietnamensis Than, 1980 . We did not see the former in Korea , but found two other species: C. uncinatus Smirnov, 1971 and C. vietnamensis Than, 1980 . Earlier Kim (1988) misidentified C. uncinatus from Korea as C. rectirostris . According to Smirnov (1998) , C. uncinatus is distributed in southern Europe, Israel , Iraq , Egypt , Ethiopia , Rift Valley in Africa, South West Siberia, Central Yakutia and Central America . The American populations most probably belong to a separate species. In general, C. uncinatus occupies the southern Palaearctic. It is recorded from the Amur basin ( Kotov et al. 2011a ), where C. rectirostris and C. fennicus Stenroos, 1898 s. lat. are also present. At the same time, its presence in tropical Vietnam , Cambodia and Thailand were put in doubt by Sinev (2011), see next section.