Identification of Ceriodaphnia Dana, 1853 (Crustacea: Cladocera) taxa from European Russia based on ephippial morphology Author Kotov, Alexey A. Author Ibragimova, Aisylu G. Author Neretina, Anna N. text Zootaxa 2018 2018-12-04 4527 1 105 123 journal article 27862 10.11646/zootaxa.4527.1.9 021796c0-cde1-4dfd-a83a-3b1c83ce466b 1175-5326 2612039 C9D04EAA-61CD-4706-9B54-026C5A7FD98F Ceriodaphnia laticaudata P.E. Müller, 1867 ( Figs. 3–4 ) Length about 0.4–0.45 mm , width about 0.66–0.7 of length. In lateral view, ephippium asymmetrical, narrowing posteriorly; dorsal margin straight; ventral margin regularly curved from postero-ventral to anterior margin which is almost perpendicular to dorsal margin ( Figs. 3A, E , 4 A–D). Paired latero-dorsal ridges absent ( Figs. 3 B–C). A depression along dorsum separating two halves of ephippium well-visible; sculpture of dorsal plate as a few wavy longitudinal wrinkles and numerous spots of minute tubercles ( Figs. 3D, F ). Egg locule visibly extending laterally ( Figs. 3 B–C), without any wrinkles, but with numerous, densely located semicircular projections ( Figs. 3 E–H) well-visible also under optical microscope ( Fig. 4E ); a circular row of minute tubercles on each semicircular projection ( Fig. 3G ). Space between egg locule and dorsal margin with low, flattened projections (not associated with any air-spaces), bearing minute tubercles ( Fig. 3F ). Rest of ephippium surface covered by low, densely located flattened domes ( Fig. 3H ) – external signs of air-spaces which are well-visible under light microscope ( Figs. 4 C– F), each dome with a spot of minute tubercles. Ephippium with narrow ventral rim lacking any sculpture ( Fig. 3E ).