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

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Kurzia Dybowski & Grochowski, 1894


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. 11View FIGURE 11. A – E 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. 11View FIGURE 11. A – E 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. 11View FIGURE 11. A – E 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. 13View FIGURE 13. A – B 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.