Polarised light micrograph of a Tisbe battagliai copepod, a key research model organism for studying the impact of microplastics in aquatic environments. This tiny crustaceans segmented body, long antennae, and numerous limbs are clearly visible. T. battagliai plays an essential role in marine ecosystems, serving as both prey and a subject for pollution research. Its transparent exoskeleton allows for in-depth observation of microplastic ingestion, making it ideal for studying how these particles affect the health and behaviour of aquatic organisms. Magnification: x15 when printed with the longest axis at 10 centimetres long.