Diaptomus is a genus of copepods with a single eye spot. It is superficially similar in size and appearance to Cyclops. However it has characteristically very long first antennae that exceed the body length.

(if to genus only)

Please provide photograph to support records.

Larger freshwater ponds, lakes and still waters.

The females carry the eggs in a single sac rather than the twin sacs seen in Cyclops.

Widespread but little recorded in Britain.

Status in Leicestershire and Rutland not known.