Ilyocryptus sordidus is a crustacean of the family Ilyocryptidae, a freshwater water flea.
Anatomy Ilyocryptus sordidus has an intense crimson colour, a small head and its dorsal edge is evenly curved. The second pair of antenna are especially short and coarse. The spine at the base of the abdominal claw is long and slender.
Males measures , while the females are .
Habitat Ilyocryptus sordidus lives in the mud of freshwater lakes (inspiring the specific name sordidus, Latin for "dirty"), tolerating pH between 4.2 and 7.1.
Distribution It is found in most parts of the world, except for Southeast Asia.
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