Cercopagis pengoi (Ostroumov, 1891)
Vadim E. Panov
Last updated: October 30th, 2006
A water flea with body size up to 2 mm and caudal process with length up to 10 mm. The head is essentially composed of a large single eye, where the amount of black pigment makes less than one half of the diameter of the eye. Parthenogenic females of the first generation that hatch from resting eggs are anatomically distinct from parthenogenic females of following generations. They have a short straight caudal spine unlike the characteristically looped caudal spine of parthenogenically-produced individuals. They prey mainly small plankton crustaceans.