Ceriodaphnia pulchella

(Figs. 9 – 10) Length about 0.35 mm, width about 0.7 of length. In lateral view, ephippium semicircular; dorsal margin straight; ventral margin regularly curved from postero-ventral to antero-ventral angle (Figs. 9 A, 10 A – C). Paired latero-dorsal ridges absent (Figs. 9 B – C). A depression along dorsum separates two halves of ephippium well-visible; sculpture of dorsal plate without any wrinkles, with numerous low spots covered by minute tubercles (Fig. 9 D). Egg locule very slightly extends laterally, without any wrinkles, in general smooth (Fig. 9 C), but bearing minute tubercles sometimes organized into spots (Fig. 9 E), probably these spots make locule surface non-transparent under light microscope (Figs. 10 D – D). Space between egg locule and dorsal margin with same sculpture. The rest of ephippium with obscure (under SEM) polygonal reticulation (Fig. 9 F) – external sign of air-spaces which are well-visible under light microscope (Figs. 10 D – F); lines of reticulation with especially minute tubercles. Ephippium has a very narrow ventral rim with obscure reticulation, lacking any tubercles (Figs. 9 F, 10 F). Note that in our material the ephippia were unusually small as compared to previous descriptions (Jaksch 1992).