Leydigia cf. ciliata Gauthier, 1939

Sinev, Artem Y. & Semenyuk, Irina I., 2021, Males and ephippial females of Oriental Chydoridae (Cladocera: Anomopoda) from Cat Tien National Park, South Vietnam, Zootaxa 4941 (3), pp. 381-398 : 391-392

Leydigia cf. ciliata Gauthier, 1939

Common species in Cat Tien ( Sinev & Korovchinsky 2013). Species was common in all samples from localities 7 and 8. Several ephippial females and males were present in locality 8 on 05.12.2017 and in locality 7 on 15.02.2018.

Morphology of studied parthenogenetic females fully agrees with the previous descriptions of L. ciliata s. str. from Africa ( Kotov et al. 2003). Males of this species were never reported from nature in South-East Asia, but were obtained by Sinev & Sanoamuang (2011) in culture by hormonal induction. Ephippial females of this species were found for the first time.

Ephippial female. Body high oval ( Fig. 7 A–B), similar in shape to that of parthenogenetic female. Ephippium ( Fig. 7C ) high oval, with distinctive dorsal ridge and weakly defined egg locules, with uneven surface and weakly developed sculpture in shape of small dot-like depressions. In preserved specimens ephippium color is yellowbrown.

Male. Morphology of males ( Fig. 6 G–I, 7D–F) from studied populations fully agree with the previous description of Sinev & Sanoamuang (2011); male postabdomen ( Fig. 6 H–I, 7E–F) of studied specimens is narrow, with parallel margins. Male of L. ciliata s. str. was described only once from a population from Niger ( Dumont & Van de Velde 1977: Fig.9 ). Specimens from Niger differ from those studied here in having a broader postabdomen (length about 2.5 height) with convex dorsal and ventral margins and defined postanal angle..

Figures

FIGURE 6. Leberis diaphanus (King, 1853) from locality 7. Ephippial female:A, lateral view; B, IDL of thoracic limb I. Adult male: C, lateral view; D, postabdomen; E, antennule; F, copulatory hook and IDL of thoracic limb I. Leydigia cf. ciliata Gauthier, 1939 from locality 7. Adult male: G, lateral view; H, postabdomen; I, postabdominal claw and distal process of postabdomen.

FIGURE 7. Leydigia cf. ciliata Gauthier, 1939 from locality 7. Ephippial female: A, lateral view; B, dorsolateral view; C, ephippium. Adult male: D, lateral view; E, postabdomen; F, distal portion of postabdomen.

FIGURE 9. Chydorus reticulatus Daday, 1898 from locality 2. Ephippial female (deformed):A, lateral view; B, frontal view; C– D, sculpture of ephippium. Dadaya macrops (Daday, 1898). from locality 6. Ephippial female: E, lateral view; F, ephippium.