Kurzia Dybowski & Grochowski, 1894

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 : 473

Kurzia Dybowski & Grochowski, 1894 (subgenus K. (Rosrokurzia) Hudec, 2000)

Parthenogenetic female short description. Body high oval, with a convex ventral margin; head and valves without a keel ( Fig. 11 L, 12A). Sculpture of valves as longitudinal lines. Posteroventral angle of valves without denticles. Rostrum moderately long and narrow. Three main head pores with a narrow connection between them; lateral head pores minute. Labral keel of variable morphology, without clusters of setulae on posterior margin.

Postabdomen ( Fig. 11 N) long, narrow, curved and narrowing distally in postanal portion, with protruding distal angle with rounded apex; length about 3.5–4.5 heights. Preanal angle well-defined; postanal angle weakly defined. Postanal denticles of moderate size. in groups; their length do not exceed width of postabdominal claw base ( Fig. 11 O, 12D). Postanal lateral groups of setulae short, shorter than the width of base of postabdominal claw. Postabdominal claw long, weakly curved, with a very short basal spine.

Antennule without lateral aesthetasc, terminal aesthetascs of variable length. Antennal seta without basal peg. Antenna ( Fig. 13 P) with thin seta on basal segment of endopodite. Spine on basal segment of exopodite very short. Spines on apical segments less than 1/3 length of apical segments. IDL of limb I with three setae; seta 1 of moderate length, setae 2–3 thin, armed with strong spines.

Taxonomic notes. K. brevilabris and K. longirostris can be clearly differentiated by morphology of labrum and head pores. Hudec (2000) allocated these two species to the subgenus Kurzia (Rostrokurzia) Hudec, 2000 . Most of the earlier records for the region belong to Kurzia longirostris , but these two species were confused in many works, including these of Idris (1983) and Maiphae (2014), thus the frequencies of each species in the region cannot be approximated at the moment.

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 )).

FIGURE 13. A – B, Leydigiopsis pulchra Van Damme & Sinev, 2013. A, lateral view. B, postabdomen. C – G. Magnaspina siamensis (Sinev & Sanoamuang, 2007). C, lateral view. D, posteroventral corner of valves. E, head pores. F, postabdomen. G, IDL and ODL of limb I. H – K, Matralona freyi (Idris & Fernando, 1981). H, lateral view. I, labrum. J, postabdomen. K, IDL and ODL of limb I. (A – B—from Van Damme & Sinev (2013); C – G, from Sinev & Sanoamuang (2007), H – K, from Sinev & Kotov (2012 )).