Ceriodaphnia

Key for identification of Ceriodaphnia species common in European Russia

(based on ephippium morphology)

1 Dorso-lateral ridges on ephippium well-recognizable................................................. C. megops

- Dorso-lateral ridges on ephippium absent of ill recognizable.................................................... 2

2 Region of egg locule with a sculpture of numerous, densely located semi-spherical prominences....................... 3

- Region of egg locule without semi-spherical prominences..................................................... 4

3 Semi-spherical prominences with few short, rarely located minute tubercles............................ C. laticaudata

- Semi-spherical prominences with relatively long, densely located minute tubercles.......................... C. rotunda

4 Surface of ephippium with numerous small column-like projections having branched tips................ C. quadrangula

- No small columns on ephippium surface................................................................... 5

5 Dorsal surface of ephippium with low spot-like projections under SEM, egg locule irregularly spotted under optical microscope...................................................................................... C. pulchella

- Dorsal surface of ephippium with thin, filiform projections under SEM, egg locule almost transparent under optical microscope...................................................................................... C. reticulata