reticulata (Jurine, 1820)

Kotov, Alexey A., Ibragimova, Aisylu G. & Neretina, Anna N., 2018, Identification of Ceriodaphnia Dana, 1853 (Crustacea: Cladocera) taxa from European Russia based on ephippial morphology, Zootaxa 4527 (1), pp. 105-123 : 118

Ceriodaphnia reticulata (Jurine, 1820)

( Figs. 11–12 )

Length about 0.6 mm, width about 0.6 of length. In lateral view, ephippium almost semicircular; dorsal margin straight; ventral margin regularly curved from postero-ventral angle to antero-ventral portion which is almost perpendicular to dorsal margin ( Figs. 11 A–C, 12A–D). Paired latero-dorsal ridges absent ( Fig. 11B ). A depression along dorsum separating two halves of ephippium well-visible ( Fig. 11B ); sculpture of dorsal plate without any wrinkles, without any spots, covered by thin, minute filiform projections ( Fig. 11D ). Egg locule very slightly extends laterally, without any wrinkles; in general smooth, but bearing minute tubercles ( Figs. 11 E–F) too small to make the surface non-transparent ( Figs. 12 D–F). Space between egg locule and dorsal margin with same sculpture. The rest of ephippium with obscure (under SEM) polygonal reticulation ( Fig. 11E ) – external sign of air-spaces which are well visible under light microscope ( Figs. 12 C–D), and sculpture as in egg locule. Ephippium with narrow ventral rim and obscure reticulation, lacking any tubercles ( Figs. 11C , 12F ).

Figures

FIGURE 11. Ceriodaphnia reticulata (Jurine, 1820), ephippial female from Cherepovetskoe Reservoir, Vologda Area. A, lateral view of female. B, dorso-lateral view of ephippium. C, lateral view. D, fragment of ephippium dorsal portion, lateral view. E–F, sculpture of its central portion. Scale bars: 0.1 mm for A–C; 0.01 mm for D–F.

FIGURE 12. Ceriodaphnia reticulata (Jurine, 1820), ephippial female from Cherepovetskoe Reservoir, Vologda Area. A–B, ephippial female with a single egg in ephippium, lateral view. C–D, opened ephippium. E–F, its dorsal and ventral portion. Scale bars: 0.1 mm.