Diacyclops trajani is a species of freshwater copepod in the family Cyclopidae, which is found in various parts of the world.

[1][2] Diacyclops trajani is a small freshwater copepod species with a characteristic body structure typical of the Cyclopoida order.

Diacyclops trajani is commonly found in freshwater habitats such as ponds, lakes, and slow-moving streams.

It lives in clear waters and is often part of the planktonic community in these environments.

As a zooplankton, D. trajani plays a main role in the aquatic food web, serving as prey for larger organisms and contributing to the nutrient cycling within aquatic ecosystems.