Pseudochydorus globosus (Baird, 1843)

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, Recent progress in studies of the Cladocera (Crustacea: Branchiopoda) of South Korea with seven new records for the Korean Peninsula, Journal of Species Research 6, pp. 227-246 : 235-238

5. Pseudochydorus globosus (Baird, 1843) ( Fig. 7)

Material deposited to NIBR. 1 parthenogenetic female from Saengmi reservoir (a large shallow lake with Trapa sp. ) (N 34.56198°, E 126.6084°), Jeollanam-do, coll. in 17 Jul 2017 by A.A. Kotov and K.S. Chae, NIBRIV0000 812492 .

Other localities. A wetland pond Bak Sil Ji 3 (N 35.5384°, E 128.1262°), Gyeongsangnam-do, coll. 15 Sept 2011 by H.G. Jeong and A. A. Kotov; A wetland lake Bak Sil

Ji 1 (N 35.5419°, E 128.1209°), Gyeongsangnam-do, coll. in 16 May 2010 by H.G. Jeong; A rice paddy (N 36.31701°, E 127.2644°), Chungcheongbuk-do, coll. in 31 Oct 2011 by H.G. Jeong; Sedongi Reservoir (N 36.31726°, E 127.2643°), Chungcheongbuk-do, coll. in 31 Oct 2011 by H.G. Jeong .

Parthenogenetic female. Body yellowish in colour, subglobular, dorsal keel absent; posterior margin round ( Fig. 7A), posterior flange of valve narrow, goes from posterodorsal angle to posteroventral angle only ( Fig. 7B). Head with a moderately long rostrum (distance between center of eye and ocellus same to distance between center of ocellus and tip of rostrum), compound eye large, ocellus three times smaller than eye ( Fig. 7A, C), tip of rostrum as rounded triangle ( Fig. 7D). Head pores typical for the subfamily Chydorinae ( Fig. 7E, F). Postabdomen subrectangular, relatively long (postanal margin three times longer than anal margin), preanal and postanal angles ill-defined, distal margin convex ( Fig. 7G, H). Postanal margin with singular, long postanal teeth, anal margin with bunches of fine setules, bunches of fine short setules laterally to postanal teeth. Postabdominal claw longer than anal margin, with two basal spines unequal in size. Antenna I typical for chydorids, antennular sensory seta arising about 1/2 of the distance from tip, largest aesthetasc longer than half length of appendage ( Fig. 7I). Antenna II short, antennal formula: setae 0-0- 3/1-1-3; spines 1-0-1/0-0-1. Seta arising from proximal endopod segment as long as two next segments, apical setae of similar thickness and length, all spines very short ( Fig. 7J). Inner distal lobe of thoracic limb I with seta 1 very thick, hook-like, seta 2 and 3 unequal in size, armed with thick spines in distal part. Scraping setae 5 and 8 on limb II with small teeth. Length 0.5-0.7 mm.

Notes. P. bopingi Sinev, Garibian and Gu, 2016 was recently found in Vietnam and South and East China ( Sinev et al., 2016). However, populations from Korea belong to P. globosus instead of P. bopingi , as they have all diagnostic characters of the former: (1) a relatively large size; (2) a narrow posterior flange; (3) a longer rostrum; (4) seta on proximal segment of endopod only two times longer than middle segment of antenna II; (5) scraping spines 5 and 8 of limb II with denticles instead of setules. Therefore, the presence of P. globosus in Korea is confirmed. This species shhould be regarded as a member of the widespread Eurasian faunistic complex according to Kotov (2016).

Subfamily Aloninae Dybowski and Grochowski, 1894 emend. Frey, 1967