Which of the following is the copepod?

Correct option is A

Correct Answer: (a) Diaptomus
Explanation:
→ Diaptomus is a genus of calanoid copepods, a major group of zooplankton in freshwater systems.
→ Copepods have a distinct body plan with a single median eye in nauplius stages and thoracic appendages adapted for swimming.
Information Booster:
→ Copepods (Calanoida, Cyclopoida, Harpacticoida) are primary consumers linking phytoplankton to higher trophic levels and are used as live feed in aquaculture.
Additional Information (Other Options):
(b) Bosmina — a cladoceran (water flea).
(c) Filinia and (d) Lecana — rotifers (micro-zooplankton), not copepods.