Karualona Dumont & Silva-Briano, 2000

Sinev, Artem Y., 2016, Key for identification of Cladocera of the subfamily Aloninae (Anomopoda: Chydoridae) from South-East Asia, Zootaxa 4200 (4), pp. 451-486 : 471

Karualona Dumont & Silva-Briano, 2000

Parthenogenetic female short description. Body oval, of moderate height; head and valves without keel. Sculpture of valves as well-developed longitudinal lines. Posteroventral angle of valves with denticles of variable morphology. Rostrum short. Two main head pores with wide connection between them, lateral head pores minute ( Fig. 11 H). Labral keel of moderate width, with rounded apex, without clusters of setulae on posterior margin.

Postabdomen short and wide, with convex postanal margin and broadly rounded distal angle ( Fig. 11C ), length about 2.3–2.5 heights. Preanal angle well defined; postanal angle not defined. Postanal denticles short, in clusters. Postanal lateral groups of setulae with very long and thick distalmost seta; in distalmost groups, length of setulae exceed two widths the base of postabdominal claw. Postabdominal claw short, curved, with very short basal spine.

Antennule without lateral aesthetascs; all terminal aesthetascs of similar length. Antennal seta without basal peg. Antenna with thin seta on basal segment of endopod ( Fig. 11E ).Spine on basal segment of exopodite two times shorter than middle segment; spine on apical segment of exopodite about 2/3 length of apical segment; spine on apical segment of endopodite about 1/3 length of apical segment. IDL of limb I with three setae; seta 1 welldeveloped; setae 2–3 thin, armed with spinulae ( Fig. 11E ).

Taxonomic notes. The Karualona of South-East Asia needs revision. According to Kotov et al. (2013) and Van Damme et al. (2013) there are several morphotypes of K. cf. karua in the area, which differs by details of postabdomen armament and length of basal spine of postabdominal claw, but full description for any of these morphotypes was not completed, and their status is unclear. Here, I am inclined to treat all these morphotypes as K. karua s. lato. Other two taxa, present in the area, clearly differs from K. karua s. lato by morphology of posteroventral angle of valves.

Figures

FIGURE 11. A – E. Karualona karua (King, 1853) s. lato. A, lateral view. B, posteroventral corner of valves. C, postabdomen. D, antenna. E, IDL and ODL of limb I. F – H. Karualona kwangsiensis (Chiang, 1963). F, lateral view. G, posteroventral corner of valves. H, head pores. I – K. Karualona serrata Van Damme, Maiphae & Sa-Adrit, 2013. I, lateral view. J, posteroventral corner of valves. K, postabdominal claw. Kurzia brevilabris Rajapaksa & Fernando, 1986. L, lateral view. M, head pores. N, postabdomen. O, postanal margin of valves. P, antenna. (A – E, from Sinev et al. (2015); F – H, L – O, orig. I – K, from Sinev & Korovchinsky (2013 )).