Genus Orchestia is a scientific classification that encompasses multiple species of sandhoppers. Sandhoppers are small, jumping crustaceans found on beaches and mudflats around the world. The genus Orchestia includes species such as the common sandhopper (Orchestia gammarella) and the rough-legged sandhopper (Orchestia cavimana). Other synonyms for genus Orchestia include the family Talitridae, the order Amphipoda, and the subphylum Crustacea. Scientists use these synonyms to describe the relationship between different species and groups of organisms. By understanding the classification system, researchers can better study and understand the ecology and behavior of sandhoppers and other crustaceans.